You all returned to Flipside, and to Merlin's house. 

Merlin: Ah, welcome back herores! Do you have the seventh Pure Heart? 

(Y/N): Well- 

You showed it to him. 

Merlin: AGH! What happened to it? 

Ruby: The Void destroyed the world, and the Pure Heart ... it's a rock now. 

Merlin: I do not feel the typical energy from this Pure Heart. Even if you set this in a Heart Pillar, it would do nothing. What to do...

Tippi: Oh... But then...how do we save him... I mean... How do we save... everyone...from destruction?

Merlin: To stop this prophecy, we must defeat Count Bleck, who started all of this... But to do that, we will need all eight Pure Hearts, as the Light Prognosticus says. We are between a rock and a hard place...

???: Ah ha ha. The forlorn group of heroes, how they cry! The tears flow like sad chowder! 

Dimentio appeared. 

(Y/N): DIMENTIO! How did you -What?! How?!

Dimentio: Oh, bad news for you! There is no way in this world to restore the Pure Heart... Yes, sadly, your hard work was all...in...vain.

Bowser: Urrrgh... Are you serious? That...really stinks!

Dimentio: Ah ha ha. Yes, it does, and that's why I decided to give you a consolation prize...

(Y/N): And what do you mean by- HEY! 

Peach: NO! 

Bowser: WHAT THE?! 

You, Peach, and Bowser were put in blocks! 

Dimentio: CIAO! 

He snapped his fingers and- 

(Y/N), Peach, and Bowser: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARGH! 

You all blew up into nothing! 

Merlin: WHAT?! WHAT THE?! 

Ruby: (Y/N)! PEACH! BOWSER! 

Nora: HEY! YOU DEMENTED JESTER! WHAT DID YOU DO TO OUR FRIENDS ... AND BOWSER?! 

Dimentio: It's quite simple... I fulfilled their wishes! I sent them to the next world! Ah ha ha. You do know who I am, right? I am your enemy, Dimentio! I serve Count Bleck! Well, as pleasant as this is, I must go. Ciao! 

He then left. 

Weiss: This can't be. 

Blake: They're ... gone. 

Tippi: (Y/N) ... no. 

Soon... 

You woke up in a dark area. 

(Y/N): Huh? Where am I? This looks like Hell. But ... darker? 

???: Why hello stranger! 

A demon appeared. 

Demon: Hey, new face! So tell me... First time down here in The Underwhere? ...HA! Just a little joke. People don't arrive HERE twice! Hahahahahaha!

(Y/N): Underwhere? Is this some sort of prank? 

Demon: You're kidding right, man? Sheesh, this is where people go when people have no more lives. It's like World -1. 

(Y/N): But I feel alive. And no halo on my head. 

Demon: Hahahaha! Yeah, I've heard THAT before. Denial, always the first step. Maybe you just need to hear it from Queen Jaydes. She's the scariest thing in The Underwhere...and that is SAYING something. She rules over us Shaydes, and she'll tell you straight...your life is OVER!

(Y/N): I will go and see her then! 

On the way... 

You noticed a beautiful girl nearby. 

(Y/N): An angel? 

???: Ohhh me... I wonder if I shall meet my most special someone this day? Surely he is a prince of countenance fair, pining even now to meet me...

(Y/N): Uh ... hello? 

???: Pray, what call hast thou to stare at me so?! Begone! 

(Y/N): What? 

You noticed she was blushing. 

(Y/N): A tsundere angel? That's a new concept I thought I wouldn't see. 

Soon... 

You took a ride across a river and find the palace of- 

Queen Jaydes

Queen Jaydes: You... What business have you with me? I am Queen Jaydes. Mistress of The Underwhere! Ruler of those with ended lives!

(Y/N): Look, I'm really not supposed to be here. I- 

Queen Jaydes sensed something on you. 

Queen Jaydes: Hm? I sense a strange energy... Have you brought something strange into The Underwhere, by chance?

(Y/N): You mean the Pure Heart? 

You brought out the rock Pure Heart. 

Queen Jaydes: No, no... It could not be... But how... It is badly damaged, yes...but what you hold is a Pure Heart! Who exactly ARE you, to have a Pure Heart...and what has happened to it?

(Y/N): Well you see Queen Jaydes- 

Her phone began to ring. 

Queen Jaydes: Oh wait, the phone. Sorry, I have to take this. 

She answered the call. 

Queen Jaydes: What is it now, Grams? I'm working and- WHAT?! LUVBI IS MISSING?! OH MERCY! I UNDERSTAND! Yes, I will see to it. 

She hung up the phone. 

Queen Jaydes: Just great. Just what I need. I am already shorthanded... What am I going to do?

(Y/N): Uh, hello? 

Queen Jaydes: Maybe you can help. 

(Y/N): What's the problem? 

Queen Jaydes: That phone call I received just now? It was the king of The Overthere, Grambi... One of the Nimbis vanished from The Overthere, and he asked me to look for her. But I cannot abandon my duties here in the palace...and my Demons are all busy. So it must fall to you! Will you search for this missing person in my place?

(Y/N): Sure thing! I can handle it! 

Queen Jaydes: Thank you so much. I'm sorry to put you up to this, but- 

(Y/N): A hero never turns down a fair lady's request. 

Queen Jaydes: My, what a gentleman you are. Well, her name is Luvbi. And you are? 

(Y/N): (Y/N) (L/N). 

Queen Jaydes: Well (Y/N), I should hold onto the Pure Heart for you. 

(Y/N): Okay, if you want. 

You gave it to her. 

Queen Jaydes: Also, I heard that someone fell into the River Twygz. Some say it was someone with long blonde hair. I would suggest you check there first. 

(Y/N): Right! I'm on it! 

You head to the river and dive in! 

https://youtu.be/BcD52wKrA94

Several hands were reaching, trying to keep you in place, but your Armament Haki was protecting you, and letting them know that you didn't fear them. 

You persevered to the bottom and went through the waterways of the river. 

And then- 

???: Geez. How did I get here? I swear, that asshole Count Bleck is going to regret messing with my mind. I- 

(Y/N): YANG?! YANG! 

You ran and hugged her! 

Yang: HEY! I- (Y/N)! HAHAHAHA! 

She hugged you and gave you a big kiss on your lips! 

Yang: I MISSED YOU BABE! 

(Y/N): I missed you too. It felt wrong going on an adventure without you making a pun or two. 

Yang: Yeah, that would have been a dead on arrival adventure! 

(Y/N): HAHAHAHAHAHAHA! Man, that actually felt good. But what are you doing down here? 

Yang: Beats me. Where are we? 

(Y/N): The Underwhere, the land of ended lives. 

Yang: So, we're dead? 

(Y/N): I don't know. I don't feel dead. 

Yang: Me either. So, what are you up to?

(Y/N): The ruler, Queen Jaydes asked me to find this girl named Luvbi, and we found a Pure Heart, and she's taking care of it. 

Yang: I see. Well, I'm glad to see you here. Man, this is going to be good! 

Soon... 

You and Yang ran into Luvbi. And you recognized her! 

(Y/N): That tsundere angel from before! 

You and Yang approach her. 

Luvbi: Oh hurry! Hasten to me, my prince! 

(Y/N): Uh ... hi? 

Luvbi: Foulness! You return? Talk not to me as though we have met! Speak, now! Waht dost thou want of me? 

(Y/N): Well, we came here to find you because- 

Luvbi: As if I would consort with someone of your quality! I await a handsome prince! Understand?! PRINCES ONLY! Oh, but hold a moment... Ha HA! Dost thou claim to be the prince for whom I pine? Priceless... Yea, verily... Very well then, good prince. Let us confirm thy lineage. If thou art my prince, then surely thou knowest my name. Speak it to mine ears! If teh name is true, I shall admit thou art mine one and only. 

(Y/N): It's Luvbi. 

Luvbi: WHAAAAAAAAAAAT?! H-H-How hast thou come by the knowledge of my name? No... Doth this mean...

(Y/N): Luvbi, we just- 

Luvbi: Nay nay! Unpleasant! Such foulness! I cannot date a man who is unpleasant to my eyes! 

She blushed very heard. 

Yang: I think she likes you man. 

Luvbi: I shall return to mother! 

(Y/N): Hmph. Looks like it worked. 

Soon... 

You return to Queen Jaydes' Palace with Yang. 

Luvbi: HALT! Thou art no princes! Thou art liars! Thou approaches me at my moth- 

Queen Jaydes: LUVBI! DON'T BE RUDE TO THEM! This happened because you left without permissioN! Now apologize to these nice people at once! 

Luvbi: Y-Yea ... Mother. 

She went to you. 

Luvbi: I ... am ... sorry ... thou art not unpleasant. 

Queen Jaydes: Oh Luvbi, dear, you had us all worried. (Y/N), please take this. 

She returned the Pure Heart, and- 

(Y/): HOLY CRAP! IT'S BACK! 

It was glowing and purple again! 

Yang: Wow, that's some treatment! 

Queen Jaydes: I have power over life and death, you see. And I was able to use that power to restore this Pure Heart. I know not how you found it, but this Pure Heart shows that fate is on your side. Take good care of it.

(Y/N): Thanks! 

You took it. 

Queen Jaydes: I also found out that you both have been sent here while still alive. My power can take you back to where you started from if you wish. 

(Y/N): Sure! Thanks! 

Queen Jaydes: Very well then. 

She began to chant a magic spell and- 

(Y/N): Hang on Yang! 

Yang: Hang onto- WAAAAAAAAAAAAAAAAAAAAAGH! 

You and Yang went through a portal full of weird things. 

https://youtu.be/wUI6E-PdTo4

And soon... 

You and Yang landed on the Flipside Tower! 

(Y/N): WE'RE BACK! YES! 

Yang: Wait, where are we? 

(Y/N): We're in- 

Ruby: (Y/N)! AND- SIS!!! 

Yang: RUBY!!! 

Ruby and Yang hugged each other tightly! 

(Y/N): Aww! 

Ruby: I MISSED YOU SO MUCH YANG! GOD! I WAS SO SCARED! 

Weiss: (Y/N)! YANG! 

Weiss hugged them both. 

Yang: Weiss? Hey, what's gotten into you Ice Queen? 

Weiss: Idiot! Do you know how worried we were?! God damn it, don't scare us again like that! 

Blake: Wait, is that really- 

Blake began to cry a storm! 

Blake: YAAAAAAAAAAAAAAAAAAAAAAAAAAAANNNNNNNNNNNNNNNG! 

She hugged her. 

(Y/N): Aww! Blake! That's- 

Blake: I THOUGHT YOU WERE GONE FOR GOOD! I- 

Yang kissed Blake, passionately. 

Yang: Hey, don't worry Kitten, I'm here. 

(Y/N): God, that's adorable. 

Blake was purring against Yang while rubbing her face into her girlfriend's breasts and face. 

Then you all just group hugged each other! 

Ruby: We're all back together again! 

Weiss: You know, it feels good like this. 

Yang: You said it Ice Queen! 

Tippi and Team JNPR arrived as well to see it happen. 

Rin: Yang's back? 

Jeanne: How did- (Y/N)?! 

(Y/N): Guys, I found Yang! 

Tippi: So, that's her? 

Yang: Uh ... the butterfly there is talking. 

Nora: Girl, you missed a lot. 

Yang: Yeah, I think I need a recap here. 

Later... 

Merlin: I see. The Light Prognosticus did say that the seventh lost Pure Heart will draw two together. And when the light returns, the brilliance would show the way to the last hero. I suppose this girl is our final hero. 

Yang: Sup Beardo? I'm Yang Xiao-Long! 

Tippi: But what about Princess Peach and Bowser? 

(Y/N): I don't know. I couldn't find them down there. All I found was Yang. 

Tippi: How do we proceed? Well, if you and Yang came here, then perhaps we can also find Peach and Bowser. 

(Y/N): Exactly! 

Pyrrha: So, I guess we can only put the Pure Heart in the Heart Pillar then. 

(Y/N): That's right Pyrrha. All we can do for now is look for the last one.