[In a unknown place]
The same hooded figure mentioned before was seen going to a broken down castle

He walked into it and saw something that gave him a creepy smile..

???: Perfect.

[Y/n's POV]

After my first rider battle against the Gurongi, We all headed back to the guild to rest and eat up. Aqua was stinky as hell, so she had to shower first. We had the Frog Legs from the toads that we killed. Before i can even take a bite fro. The meaty leg, i was then being questioned by both Kazuma and Aqua..

Kazuma: This..HOW CAN YOU TRANSFORM INTO THESE GUYS?!?

Aqua: Do you have more???

Y/n: Yes i do. 36 Kamen Riders in total.

Aqua/Kazuma: 36?!

Y/n: Yep. 15 Shōwa, 20 Heisei and one Reiwa. Here, i'll show you..*takes out SHR booker and opens it, revealing the riders* The first 15 that you see here are the Shōwa Era Rider's.
They are the first Kamen Riders from the Shōwa Period of Japan, which took place from 1926 to 1989.

Kazuma: Shōwa?

Y/n: I'll explain the meaning. The two Chinese characters (kanji) in the name Shōwa translate as "Bright Peace" in Japanese. However, a more nuanced interpretation is "Enlightened Harmony"-with the added significance that the second character (wa) is commonly used in words that describe Japan or things Japanese.

Aqua: Wow..when you put it that way, it means Peaceful, right?

Y/n: Yeah. But let's talk about the quest we did.

Kazuma: *holding frog legs* 5,000 Eris per frog...We risked our lives and earned no more than part-time construction work pays.

Aqua: *takes bite* This is surprising. It's a little tough, but the texture's quite nice. There's no way the three of us can handle them by ourselves. Let's recruit more allies.

Kazuma: You say "allies", but the only one worth anything is y/n here. Do you really anyone will party up with us?

Aqua: You've got me here. *takes a huge chunk out of frog leg* so allies-

Y/n & Kazuma: Swallow your food!

Aqua then swallows her food, chugs down her mug and starts talking again.

Aqua: I'm an arch priest, one the advance jobs, while y/n is an High Adventuer..another advance job! Anyone would kill to have us in their party! If I offhandedly decided to recruit members, there'd be tons of people saying, "Please! Take me with you!" Now that we've got that straight, hand me another piece of fried frog !*starts eating*

Y/n: It's toad.

Kazuma: Oh?

[The Next Day]
The three of them were sitting on a bench waiting for people to show up. But so far.. no one has.

Aqua: Nobody's coming.

Kazuma: More than half a day has passed after we posted the recruitment offer, but no prospective future heroes showed up.

Y/n: Well..our recruitment paper did intimidate them. I mean, look at this:

Recruitment Paper:
Immediate opening! We're a cozy, harmonious party, Any adventures who wish to journal with the beautiful and noble arch priest, Aqua-Sama, need look no further! Then some praises about Aqua she wrote. Hiring requirements: adventures in advanced job classes only.

Y/n: See...people won't be interested in joining with this.

Kazuma: let's lower the bar a little. Recruiting only members in advanced jobs is way to strict, right y/n?

Y/n: He has a point Aqua.

Aqua: But... But...

Kazuma: At this rate, not a single person will come. I mean, you two may be in advance class, but I'm still in the weakest. I'll feel ashamed if I'm completely surrounded by the elite.

Aqua: B-but, but..

Kazuma: At this rate, not a single person will come. I mean, you two may be in advance class, but I'm still in the weakest. I'll feel ashamed if I'm completely surrounded by the elite.

Y/n: Poor guy..

While Kazuma was talking about his current stats, Y/n felt tapping on his armor pad on his shoulder. He turned around to see a young girl with shoulder-length dark brown hair (smooth black in light novel) and crimson colored eyes. She wears a classical witch attire such as a black cloak with gold border, choker, wizard's hat, fingerless gloves, and carries a black staff.

???: I happen to recognize your recruitment poster.

Y/n: Oh..is that so?

Kazuma and Aqua turned to y/n taking to the new girl in front of them..

???: Hehe. That we would meet is a fate chosen by the world itself. I have anxiously awaited the arrival of those such as yourselves. My name is Megumin. My calling is that of an arch wizard, one who controls explosion magic, the strongest of all offensive magic!

While saying that she did a pose that someone could only describe as cute.

Kazuma: Um...

Megumin: Do you three desire my forbidden strength, which is so almighty, I've been ostracized by the entire world?

Aqua: Huh?

Megumin: Then show me thine resolve to peer into the ultimate abyss with me! When man stares into the abyss, the abyss stares back.

[Cricket's Chirping]

Kazuma: Are you here to poke fun at us?

Megumin: N-No!

Aqua: *notices something about Megumin* That red eye... Are you a crimson demon?

Megumin: Indeed! I am Megumin, user of the finest magic crimson demons possess! My lethal magic demolishes mountains, smashes boulders...

She dropped to the floor, face first while talking and the boys got up to check on her.

Kazuma: Hey, what's wrong?!

Y/n: Are you alright?!

Megumin: *starts to get up* I haven't eaten anything in three days. Do you have anything to eat?

Kazuma: We don't mind treating you, but what's with that eyepatch? If you're injured, why don't we have her heal you?

Y/n: Yeah, it's basically the one good thing she can do.

Aqua: "one"?!

Megumin: This is the magic item that suppresses my mighty magical powers. If I were ever to take this off a great catastrophe would surely befall this world...

Kazuma: So it's like a seal?

Megumin: Well ,that was a lie. I just wear it for looks.

With a blank stare, Kazuma rushed in and grabbed Megumin's eyepatch and pulled on it.

Megumin: I'm sorry! Please don't pull on it! Stop... Stop it! Actually, it'll hurt if you just let go, so please just slowly put it back where it was. That's right, slowly, slowly...

Aqua: You know, crimson demons are born with high intelligence, and possess magical powers. Generally, they're all expert magicians and all have weird names.

Kazuma: Oh?

Y/n: You don't say..

He then let go and the eye patch snapped backed into her eye.

Megumin: Ow! My poor eye!

Kazuma: Sorry, I thought you were making fun of us. You were talking gibberish and gave us that weird name.

Megumin: Ugh.. Calling my name weird is rude. From my point of view, it's everyone else in town who has a weird name.

Kazuma: By the way, what are your parents' names?

Megumin: My mother is Yuiyui and my father is Hyoizaburo!

Y/n:...

Aqua:...

Kazuma: So this girl's clan has a lot of good magicians, right?

Megumin: Hey! If you've got something against my parents' names, let's hear it!

[Timeskip]
We were examining Megumin's adventurer card while she was snoring away on the table.

Aqua: Adventurer cards can't be forged. She's also an arch wizard for sure. She's in a similar class as me!

Y/n: That's a good thing. This girl must pack some incredible strength in magic..

Aqua: Also, if she really could use explosion magic, then that's amazing! It's the most advanced attack there is!

Megumin: Hey, don't call me "that girl" and "she." I'd prefer if you called me by name. *stomach growls*

Y/n: *hands Megumin a menu* Go ahead and order something, fellow arch wizard. *pets her head*

Megumin: *blushes a little fron being petted* S-sure.

After the group are done eating, they went out to the same grasslands to finish the quest.

Quest Objective: Defeat 5 "Giant Toads" In 3 Days(current kills: 2)

Megumin: Explosion magic is the strongest magic, but that means it takes time to prepare. Please keep that frog at bay until my preparations are complete.

Kazuma: Right! I'll do it!

Aqua: Guys! There's another over there.

We turn to see another giant toad hopping over to us.

Y/n: Two at once?

Kazuma: You know, I didn't notice all the colors they come in.

Y/n Target the one in the distance with your magic and Kazuma.. you stay here with Megumi.

Megumin: Understood.

Kazuma: Ok

Y/n: As for the closer one... Hey, let's go, Aqua. You are a former something-or-other, right? Show off some of that former ability of yours

Aqua: *goatees at y/n* What do you mean "former"?! I am a goddess! Present tense!

Megumin: Goddess?

Kazuma: Oh, she likes to call herself that. It's rather sad.

Y/n: We tried to get her to stop, but it's proven less than successful.

Megumin: How sad...

Aqua: *shaken up* Wh-What?! These frogs may be wrong against physical attacks, but this time for sure...

Aqua then runs off towards a Toad, as she prepares her attack

Aqua: Watch this you two! I'll show you the power of a goddess today for sure! Tremble before me and fall asleep! God Requiem! "God Requiem" is a goddess's requiem of love and sorrow! Any it strikes will perish!

The white and black toad bit down on Aqua and lift her into the air, catching her in its mouth. Aqua tries to escape the foul smelling cavern, but gets sucked back in each time.

*I could watch this for hours*

Aqua: *repeatedly* Help-*gets pulled in, before coming out for a second* Me!!

Y/n and Kazuma can only watch with odder disappointment, seeing the Toad playing with Aqua..

Your reaction:

Y/n: Hey, didn't she say the same thing for her last move?

Kazuma: Yeah, that's a goddess for you. She put her life on the line to buy us some time.

Y/n: A noble sacrifice.

Y/n and Kazuma felt a pressure and turned to see Megumin cast her spell.

Megumin: Darkness blacker than black and darker than dark, I beseech thee, combine with my deep crimson. The time of awakening cometh. Justice, fallen upon the infallible boundary, appear now as an intangible distortions! I desire for my torrent of power a destructive force: a destructive force without equal! Return all creation to cinders, and come frome the abyss! Explosion!

Light flashed through the plains, forcing Kazuma and Y/n to shield their eyes. The light emitted from the tip of Megumin's staff arches towards the distance, hitting the toad approaching us dead on! The violent effect of the spell can be seen immediately. That dazzling light and the deep, earth-rending boom reverberating in the air, a torrent of flame racing into the sky replacing the toads existence, vaporizing the large amphibian instantaneously. Y/n opened his eyes to witness a large smoking crater of where the amphibian used to be. He also saw that he was a few meters away.

Y/n: Damn. Talk about a explosion.

Kazuma: So..this is explosion magic.

There was a rumbling sound and then another giant green toad came from out of the ground.

Kazuma: Did the explosion wake it?

Y/n: seems like it. Megumin! Let's back off for now and-

Megumin is sliding face first down the hill, seemingly motionless, while the other toad is thrashing Aqua's legs left and right..

Y/n & Kazuma: Huh?

Megumin: While my mystic art, explosion magic, possess tremendous might, it also consumes tremendous magical power. In, short, I used magic exceeding my limits, so now I can't move a muscle.

Y/n: Huh?

Kazuma: You're serious?

Megumin: I never expected a frog to pop up so close by. This is bad. I'm going to be eaten. Sorry, could you please do something be-

Megumin was then cut off by a giant toad gobbling her up. Both Toads started to swallow the girls slowly..

Y/n and Kazuma: *screams, before charging at the Toad*

Y/n: I got Megumin, you get Aqua!

Kazuma: Are you serio-

Y/n: *Brandishes his sword out* Just do what the hell i said!!

Kazuma: Eep! R-right!

Both boys jumped and lunged at the Toads and attacked them furiously until they were slain..

(Quest)
Killed 3 Toads!

Daily Quest Completed: Defeat 5 Giant Toads.(Successfully killed 5 in Total
Reward: 15000 eris

[Y/n's POV]

After they were gone, I picked up Megumin and placed her on my back and carried her back to the guild, while Aqua and Kazuma followed. Unlucky, We were all covered in slime except for Kazuma. When saving Megumin the toad got me covered in slime.

Aqua: I stink... I stink...

Megumin: The inside of a frog stinks, but it feels nice and warm.

Kazuma: That's information I didn't need to know.

Y/n: Same here and once again, Aqua..it's a toad.

Kazuma: *looking at Megumin* You're banned from using explosion magic, except in emergencies. Just do your best with other magic from now on.

Megumin: I can't.

Everyone, including me stopped walking and look at her.

Kazuma: Huh?

Megumin: I can only use explosion magic. I can't use any other type of magic.

Kazuma: For real?

Megumin: For real.

The both of them stared for a little while. Kinda creeped me out though.

Aqua: Huh? If your level is high enough to use explosion magic, shouldn't you be able to use other magic, too? Even I didn't learn all the arch priest spells until after I learned the party trick skills.

Kazuma: What the heck would you use "Party trick" skills for?

Y/n: Maybe for distraction and/or just for entertainment

Megumin: I'm an arch wizard who loves explosion magic above all else. I don't like any other magic in the detonation family. I only like explosion magic! *starts tightening her grip on my neck*

Y/n: Umm..M-megumin..

Megumin: I could, of course, easily go on adventures if I learned other magic, but that just won't do! I only love explosion magic! Even if only one use per day is my limit, or I collapse after using my magic, explosion magic is still the only magic I'll ever love! After all, I chose the path of an arch wizard solely so I could use explosion magic!

Aqua: Wonderful! Simply Wonderful! In effective though it is, I'm moved by your romantic pursuit!

Kazuma: *thinking* Damn..this wizard is hopeless. The fact that Aqua sympathizes with her. Based on their two fights, I highly suspect that this goddes is also completely useless. *sighs*Frankly, I don't need any more problem children to put up with.

I looked back to see the two girls smile at each other before giving each other a thumbs up..

Y/n: Cute. She really have a positive attitude about her explosion magic.

Kazuma: I see! I'm sure the path ahead of you will be thorny, but you do your best! *walks towards me and Megumin with a false smile* Once we reached the guild, we'll split the reward evenly, then when we get the chance, let's meet up somewhere-

He was then cut off from talking by Megumin..

Megumin: My only desire is to use my explosion magic. I'd be fine with going unpaid if need be. Yes, the power of another arch wizard can be yours for the low cost of food and sundries! What choice do you all have, but to make a long-term contract with me?

Kazuma: No, no, no! Piggyback ride is over, now come on!

Kazuma grabbed Megumin and tried to rip her off my back, but she tightened her hold on me, unknowingly causing her to strangle my neck in the process.

Kazuma: Such mighty power would be wasted on a puny party of novice adventurers like us.

Y/n: *feels offended, while trying to free his neck a little* N-novice!?

Megumin: No, no, no! *wraps legs around you waist* It's fine, even if you are puny or novices! I have an advance job, but I'm only level six. *feels herself being pulled harder* Hey, I wish you wouldn't try to tear me away!

Kazuma: No, no, no! *pulls harder* What kind of magician can only use a spell once a day?!

Y/n: *starts to choke a little, while trying to have some breathing space* Why must I be the one that suffers??

Kazuma: Hey, let go of him! You got dumped by another party, didn't you? * Megumin grips harder* Hey I said let go! Heck, if we go into a dungeon, there won't be enough room to use explosion magic! You get more useless by the second.

[No one's POV]
As y/n gets on one knee try not to choke to death, Kazuma pulls harder to pry Megumin off, also causing slime to be thrown around Aqua..

Y/n: *thinking, while face states turning red*

Aqua: Hey, stop! *Shields her face* You're getting it on my face!

Megumin:*finally starts to beg* No other parties will take me anymore! I'll carry your study, or whatever else you need! I'm begging you! Please don't abandon me!

Unknown to all four of them, they're were three women were observing the argument going until one of them spoke.

Lady #1: How awful. That man's trying to abandon that little girl!

That caused Kazuma to stop, which allowed Megumin to loosen her grip and allowing y/n to finally breathe again..

Y/n: *deep inhale* Oh, Thank Eris!

Lady #2: And he's got a girl and that other man covered in snot beside him. He must be blackmailing the other man

Lady #3: Toying with such a little girl, then discarding her? What a scumbag.

Lady #1: Look! All three of them are all slimy! What sort of perveted acts could he have them doing?

Kazuma: *starts to panic* I-It's not like that!

Megumin got a dark smug look in her eyes as she looked into Kazuma's panicked ones.

Megumin: *speaks loud enough for everyone to hear* I'm fine with whatever erotic acts you like! I'll show you i can even endure that slimy act we did with the frogs. Just please stop making me do it in front of y/n. He's the only one i have left that loves me!

Y/n: *thinking* For a little girl, she can be bold.

The three women turned away trying not to listen to anymore, while Kazuma quickly closed Megumin's mouth.

Y/n: Kazuma, just stop trying, alright? Let's just allow her to be in our group.

Megumin: *eyes sparkle* Really?! You will let me stay??

Y/n: *turns to Kazuma* How about you..rapi-

Kazuma: I get it! Glad to have you on board!

Megumin: *smiles Sheepishly in victory* EEEEEEE!!!!

[Timeskip]*with y/n*
We were in the guild, resting from the..uncomfortable situation earlier. While all of us took separate bath and dried ourselves with new clothing, Kazuma went to get the rewards. We split the money and decided to go to sleep. I decided to stick around in the guild longer, so i told them that i be back in the inn late. While they were gone, i looked into my card and it said that i have leveled up a total of 25 levels.

Y/n: Hmm? I have many skill points to use. I guess that a trait for obtaining all Kamen Rider Powers, Canon or not. *rubs chin* What should i get?

BOOOMMM!!

Everyone was shaken up by multiple explosions that suddenly happen to form.

Y/n: You have got to be kidding me...

I got up and went outside to see what was going on. I looked to see many people injured. Luna was on the ground, bleeding on her side, while crawling away from a cloaked figure.

Luna: *holds her bleeding hip, while crawling back* S-stay away from me!

???: I'm afraid i can't do that, ma'am.

He raised his blade in an attempt to end her life. I couldn't allow that to happen. So, i brought my sword out and charged towards the man, who is lowering his blade. Luckily, I jumped in front of him and blocked his weapon from touching her.

Luna: Y-y/n?

Y/n: *kicks the figure away from Luna* I got you.

I picked her up bridal style and ran towards a shop that has some damage, but was structurally still standing..

Y/n: *places her down in a seat* You'll be safe here.

Luna: T-thank you, y/n.

I nodded and went back outside the danger. Some adventurers tried to charge in at the hooded figure to attack, but the person opened up a grey wall above and a bunch of Imagin charged down at the adventurers and mowed them down one by one.

Kazuma, Aqua and Megumin are probably dead asleep from this
Y/n: Hey!

The Imagin and the cloaked figure turned their heads.

Y/n: You dirty son of a bitch, why are you attacking these people?!

???: *raises finger* Hey, now. Thats not the right way to talk to your elders.

He then removed his cloak to reveal one of the evil riders on Den-O: Gaoh

Y/n: Gaoh.

Gaoh: So, my lord was right about you. You do have your rider knowledge. But unfortunately, you must perish.

An orange flaming aura surrounded his waist and formed the Gaoh belt. He even took out the Infinity Rider Pass

He then pressed a button on the transformation device, as a sinister jingle ran out..

Gaoh: Henshin...

He closes his eyes and makes the pass fly into the scanner of his belt..

GAOH FORM!

Orange pixels exploded out of the Gaoh belt and combined with the person to form his rider form.

*Personally..I thought it was a deep shame they scrapped this rider costume to make Skull and Hijack forms*

Gaoh: For this world..I will devour Everything!

Y/n: Aww, man..what can i do?

All of a sudden, the Gandaride Driver and the SHR Booker appeared on my waist. Something illuminated inside the compartment, so I opened it to showing a glowing card. I then took it out and the light diminished, revealing the next rider that I can be..

Y/n: Decade?!

I scanned the card on the driver and the while thing started pixelating before shifting into the DecaDriver. The SHR Booker changed it's color to white as well with having Decade's logo on the  black strip..

Gaoh: Huh..just who do you think you are?

Knowing this moment and not wasting time, i opened the Ridebooker and took out Decade's henshin card.

Y/n: Torisugari no Kamen Rider da!

The Imagin was shocked for a second, as Gaoh titled his head..

Y/n: Oboeteoke! Henshin! *slides the card into the driver*

[3rd Person POV]

Kamen Ride-

Y/n returned the driver to its original position as the Decade Symbol appeared in front of the driver.

-Decade-

Suddenly the symbols of the nine first  Heisei riders appeared in clockwise around him before they became grey silhouettes of his armor before merging into y/n as energy card appeared in front of him before they collided into the rider's mask giving the armor its color.

The armor was magenta, black, and white. A white and black X was on his chest connecting to his shoulder. The lens on his mask was green as some of the cards were coming out of the mask like fins and the signal pointer on the mask flashed yellow.

Y/n knew this armor by heart he was now Kamen Rider Decade.

Gaoh: Heh..let's see what your made of. *points his GaohSlashers towards him* Attack!

Y/n: *claps his hands twice* Bring it.

I'ma gonna stop right here. Part 2 will soon.