*??? POV*

I was in a dream.  I don't know how I could tell I just could.  I was standing on a beach after dragging a blueish white haired man to shore.  He then started laughing.

???: What's so funny?

???2: I may have lost the war, but I won this battle.

???: What are you....

???2: Nova.

A small orange/red orb appeared above the man.  Every instinct in my body told me to run.  Before I could do that just that my vision goes white and my body is racked with pain.

I wake up with a start and before I could sit up all the way a hand on my chest pushes me back down.

???3: Ara Ara it's good your so energetic after just waking up, but if you get up that fast you'll hurt yourself.

???: Who are you? Where am I?

???3: I'll wait till the rest of my friends get here before I answer those.  Besides we got some questions for you.

As if on cue I hear a door open outside my vision and in walks a group of people.

(The best image I could find.  Koneko has her ears hidden)

The short haird blond girl girl sees me before diving into a box.

???: that just happened.

???4: Sorry about Gasper he's very shy around new people.

???: ...... That's a boy!?

Gasper: 😢 Eek I'm sorry please don't yell!

???: I'm sorry I was just shocked.  Can you come out so I can shake your hand?

He doesn't come out, but sticks his hand out while shaking something fierce.

Gasper: G-G-Gasper Vladi n-nice to meet you.

???: A pleasure to meet you Vladi-kun

I didn't see it, but I could've sworn I felt the others smile at me and Gasper.

???4: So let's start with introductions I am Rias Gremory, but please just Rias is fine.  The person you met when you woke up is Akeno Himejima.

Akeno: I hope we get along ufufu.

Rias: The person who found you and brought you here is Issei Hyoudo.

Issei: Yo it's good to see your awake.  Also my friends call me Ise.

Rias: The blonde girl next to Issei is Asia Argento.

Asia: Its good to see that your awake.

Rias: The blond boy is Kiba Yuuto.

Kiba: Just Kiba is fine.  Good to see you awake as well.

Rias: The white haired girl is Koneko Toujou.

Koneko: Sup.

Rias: The tall woman with silver hair is Rossweiss.

Rossweiss: It's an pleasure to finally meet you.

Rias: Xenovia Quarta is the one with blue hair.

Xenovia: hello.

Rias: Finally the girl with twin tails is Irina Shidou

Irina: Hi!  Hope we get along.

Rias: Now that introductions are over may we get your name.

???: I don't remember.

I tried hard to think on it all of a sudden my head felt like it was splitting open.  I didn't notice Asia come over until I was enveloped in a green aura as the pain receeded.

???: Huh?  How is the pain receeding?

Asia: It's......my quirk.  It's called twilight healing.  It lets me heal any injury.

???: That's so cool.  Also Rias to answer your question while it may not be my name it did appear in my head dispite the pain.

Rias: And that would be?

Arsenal: Arsenal.  I think it ment something to me before the memory loss.

Rias: Well till you remember your real name we'll just call you Arsenal.

Arsenal: Thanks.  I promise to repay my debut to you for helping me out.

???: Hey has sleeping beauty woke up yet?

In walked a man with dark hair and blond bangs.

Rias: *Sigh* Yes sensei and we are currently calling him Arsenal.  Arsenal this is our club advisor Azazel-sensei.

Arsenal: Club?

Rias: Oh right we are the occult research club or the ORC for short.  We are a club at Kouh academy.  We are currently in the old school building.

Arsenal: Ah well thanks for taking care of me I should be on my way maybe I'll find a connection to my past.

Rias: Don't worry leaving.  Since we are the only ones who use this building we converted a couple of extra rooms too bedrooms should club activites run long.  Feel free to stay until your memories return.

Arsenal: Really?!  Thank your very much.

*Rias POV*

Rias: No worries.  Issei can you show him to a room he can use please.

Issei: Understood Buchou.

Rias: 'Buchou again'

Once they were gone Azazel turned to me.

Azazel: So memory lose huh.  I wonder if we get him to open his circuits will he remember.

Rias: Possibly.  Though it might make him go berserk.  Just trying to remember his name brought a lot of physical pain.  Plus like this he trust us so I'm tempted to take our time so he forms a bond with everyone.

Azazel: Why that option if I may ask.

Rias: When Issei brought Arsenal here to be healed we found his prana reserves were nearly out.  That on top of how burned his clothes were we deduced we had a close brush with with either fire or an explosion.  To survive that he had to have used a "miracle" that tanked the damage for him but drained his reserves.  Now as he was recovering his reserves refilled and even I was shocked at the sheer absurdity that he had.  It rivaled my brothers demonic energy hands down.

Azazel: So do you want him to join the alliance?

Rias: Yes and no.  Yes because I think having him as an ally would benefit everyone.  No cause I'm sure he has others waiting for him.  I'm thinking of it as if I would let Issei go elsewhere if it made him happy vs keeping him here.

Azazel: Well onto a different topic there's a rogue devil on the edge of town.  Sirzechs should be contacting you soon.

*Time skip that night.  Arsenal POV*

Before they left the members of the ORC were acting strangely so I dawned the clothes that looked familiar.  Once everything was on I looked like a fictional ninja.  With that done I followed them.  They can to what looked like an abandoned factory.  I stayed on the outside listening for anything.

Rias: Rouge devil Goliath for the crime of killing your master you shall die.

I peeked in when i heard that and saw the ORC facing down a giant of a monster.  I watched as the ORC started to fight the giant.  It shocked me how well each of them worked together.  They had it on its back food till i smacked Akeno through the wall.

Rias: Akeno!

I went to her and when she saw me her eyes went wide.

Akeno: Why are you here?!

The others looked at where we were with shock.  While everyone was distracted the giant threw a punch towards Koneko.  Time moved in slow motion for me as I saw a green haired woman die in my mind.  Suddenly power floaded my body, yet it felt like my nerves were on fire.  Words appeared in my head as I got between the white haired girl and the giant.

Arsenal: March king of knights.  Avalon!

I held up the golden scabbard as a dome of light protected us.  I also noticed that the area was filled with emerald lightning.  As soon as the monster withdrew its hand I swung the sword in my right hand.  When my blade cut his fist, he reeled back as smoke rose from his fist.

Goliath: A holy sword wielder!?

I just stared down the beast in front of me.

Arsenal: Twin March King of Heroes and Hero of Justice.  Combo skill unlimited Babylon works.

An arena of blades surrounded us making the Goliath look at what's around him.

Issei: Arsenal what's going on?!

Arsenal: I don't know my body just moved.

Rias: Well finish him off he can't be saved.  Think of it as a mercy.

Goliath: Who are you human!

Arsenal: Me?  I'm just a nobody without their memory.  To you though I am Arsenal newest member of the ORC of Kouh academy, and personal nightmare to those who hurt my friends!

As I finished my little speech the emerald lightning returned but it fill the inside of the factory.  On top of that there was some darker forest green arcs of electricity that gouged away the ground/walls it touched.

Just then Goliath tried to punch me to which I just raised my hand that had red lines appear.  When his fist and my hand connected a shockwave was released.  When the smoke cleared I hadn't budged from my spot.

Goliath: How?!

Arsenal: Cause fuck you that's how.

After that I just followed my body's instinct and used the blades as platforms to move around the giant.  I grabbed a blade on my way and slashed at him.  Upside to this move it damaged him.  Downside I destroyed the blade in my hand.  All of a sudden my head started hurt as the arena disappeared.

Goliath: Is that your limit human?  I was hoping for better.

Arsenal: March youngest of sparda.

I felt something appear on my back yet i immediately knew how to use it.

(This minus the innuendo)

Arsenal: Good night. *throws rose*

After Goliath died my headache returned and I passed out.

ORC: Arsenal!

*Elsewhere*

???: Well well well he would make an interesting player.  Though let's change up the rules for this game.

???2: Why him?  Why start a second Reaper's game?

???: Oh silly Sally all with in due time.

Sally: My.Name.Is.Neku!

???: Anyway he just woke up let him settle into his new life before I turn it upside down.  As for your questions Sally it's cause I can and I'm bored.

*The next day*

Rossweiss: So while it may be a bit late in the year we are getting a new student.

Girl 1: I hope it's an attractive male.

Boy 1: Let it be a busty hottie.

Girl 2: Please let it not be a pervert.

Rossweiss: Please come in and introduce yourself.

Arsenal: Hello everyone my name is Ars Gremory.  You all know my older cousin Rias.

(Pronounced like Ars Arcanum from KH)

End.  See you in first day.  Let me be honest I'm tempted to thin Issei's harem to add to "Arsenal's" but I want to stick to rules I've already established.