A/N: 2 more, and it will be done

Narrator POV

Kiana: Y/N is..... Going to die?

Siegfried: Certainly. His state is a mess, he can't even stand on his leg properly

Durandal: We have to save him, but......

Bronya: Yes, Mei is still missing, we need to find her before going in action

Kiana: Yeah...... Knowing Kevin, he won't let Y/N die any time soon

Theresa: Then let's make 2 groups. Me, Siegfried, Durandal, Fu Hua, Durandal and Li Sushang will go and save Y/N. Kiana and Bronya, take care of Kevin when Mei will be found

All: Yes!

Theresa: Kiana, Bronya, if you find Y/N first, please, take care of him

Kiana: We promise

Bronya: He will be in good hands

Meanwhile.......

Y/N was working on Project STIGMA, before he started to cough violently, and even spit blood

???: You truly are a reckless idiot. Even after this much effort, you're still pushing yourself even more

He looked back, and see Raven, with a sad smile

Y/N: Hey......

Raven: You look like a mess

Y/N: I had better days......

She got to his side, and placed her hand on his shoulder

Raven: Take a rest, you're killing yourself

Y/N: I can't, or else, I won't be able to make her proud

Raven: I wasn't asking

She was about to pull him, before a bullet hit the ground, as she jumped back

???: We wouldn't want that, would we?

Gray Serpent got in the way, and stood between them

Raven: Move

Gray Serpent : Sadly, I cannot. It is almost done, and the price is almost paid fully

Raven: What prize?

Gray Serpent: The new project STIGMA is done, and to fulfil it, we need one life to be sacrificed

Her eyes widened, before she took her bow and aimed at him, glaring at him

Raven: Don't even think of using Y/N for that. He deserve that happy ending

Gray Serpent : Oh but he will, inside the Projet STIGMA, he will have this eternal happiness he wished for so long

He was about to attack her, before his body stopped moving, and fell down on the ground

Raven: .......

She used this chance to go to Y/N, and she saw

He fell unconscious due to exhausting himself too much

Raven: Let's get you somewhere safe, Raiden Mei will come soon

She was about to carry him, before he suddendly pushed her away, and a barrier was placed around her, trapping her

Y/N: Sorry.......

He showed a smile full of sorrow

Y/N: I have to do it

Taking a deep breath, he slapped his face, and smirked

Y/N: Alright! One last time!

He was about to work, before he saw through the camera Kevin started to fight Kiana Mei and Kiana, as they had new forms

Y/N: No..... It's too soon. I have to stop it

He was about to run, before his leg gave in, and he fell on the ground

Raven: Y/N! Don't do it! You're too weak and it's too dangerous! You will die !

Y/N: I...... I need to......

He slowly got up, and started to slowly walk toward the exit

Y/N: If I don't..... Everything I did..... Will be wasted.......

He rised the pace, as he started to run

Y/N: And no matter what! WE WILL HAVE THIS HAPPY ENDING!

Grey Serpent eyes shined, as he laughed

Grey Serpent: That's right! Go, and fulfil your role, Y/N!

He was running on the moon, toward where he was supposed to go

???: Y/N!

He looked at the side and saw Fu Hua running to him, but he kept running forward

She was about to catch him, before someone pushed her away, and stood between them

Fu Hua: You..... Mobius?!

Mobius: Well, if it isn't Fu Hua, you've grown since the last time

Y/N: M-Mobius?

Mobius: You can go Y/N, we will watch your back

He nodded, before going ahead

Fu Hua: You do know it's dangerous for him right?

Mobius: He will handle it, trust me. He managed to handle all 13 Flamechasers, he won't go down this easily

While still running, he spotted Durandal and Li Sushang heading to him

But they were stopped as 2 other people stand in front of them

Durandal: You?!

Su: Sadly, we cannot let you pass

Aponia: This is the way Y/N need to achieve, we cannot let you get in the way

Li Sushang: We will save him, don't stand in the way!

Y/N was getting closer and closer to the fight, before someone slammed him on the ground

It was the other Seele, that he called Veliona

Veliona: No more playing around, you need help

She dodged a kick aimed at her, as someone stood between them

Y/N: Kosma.......?

Kosma: Go

Y/N nodded, as he went away, and Kosma stared at Veliona

Veliona: I won't repeat it twice, move

Kosma: No. Y/N need to do it, and if you try to stop the one I consider a brother.....

He transformed into his Mantis form and roared at her

Kosma: I will not spare you

With Y/N, Honkai beasts were appearing and rushing at him, but they were killed by Kalpas and Sakura

Sakura : We're covering you! Go!

Kalpas: And don't you dare trip on the way!

Y/N: Alright! Thanks!

He kept running, before he came to a stop, and saw Theresa and Siegfried waiting

Theresa: I'm sorry Y/N, but we need to stop you, it's for you

Siegfried : You're a good kid, don't waste your life like that

Y/N: I'm sorry, but I can't. I've worked so hard for it, I can't stop now

Theresa: Then, we have no other choices but to force you

They took their weapon, but 2 people landed in front of Y/N

Elysia: Hi~ did you missed us Y/N?

Vill-V: It's time for the show, but you're not my assistant this time Y/N! You have another show to do right?

Elysia : So go! And do the right thing!

He smiled, before rushing forward, Elysia and Vill-V making sure he won't be stopped

Almost there, his leg gave in, as he was about to fall, but he got catched by 1 person

Pardofelis : Silly Y/N, you should watch where you walk, hehe

Y/N: Heh..... Thanks Pardo.....

She helped him walk toward the place, before he took a deep breath, and she let him go

Pardofelis : You always were a strong one Y/N, never change ok?

Y/N: I won't......

He walked forward, tall and proud, as he saw them, fighting

Kevin, in his Mantis form

And Kiana, Mei and Bronya, in their new form

He took a deep breath, before yelling with all his might

Y/N: THAT'S ENOUGH!

They stopped the fight, and looked at him, in complete shock

Kevin: Y/N?

Kiana: Y/N?! You're alive!

They rushed at him, hugging him tightly

Mei: When we fought against Grey Serpent, he told us you died......

Bronya: But in the end, you're alive, like we believed

Y/N: I'm fine, but now, it's time to stop everything

Kevin: It's too late. So Y/N, Enemy or ally, choose

Y/N: None, I'm helping everyone

He charged at him, sword in hand, but someone clashed with him, and it was the Kevin from the Elysian Realm

Kevin(ER): You've gone too far, other me. Trying to kill the one who will save everyone

Kevin:.......

Y/N: You 3 look cool in your new form! Especially you Bronya!

Bronya: Another proof I'm superior to Idiotka

Kiana,: Hey, he find me cool too you know? Adding to that you're short

Mei: Hehe, I missed those moments

Y/N: Yeah, I did too. Everything is done by the way. Project STIGMA is stopped

Kiana: What?! How!

Y/N: Easy, it's linked to my body. If I stay alive, it won't activate

Bronya: So we will protect you even more now

Y/N: Oh my I'm flattered~

They giggled and laugh, before Y/N smiled warmly at them

Y/N: Let's go ho-

A gunshot happened, as Y/N fell to his knees, his stomach bleeding

Everyone was in shock, as they looked at the one who shot, and saw it was Grey Serpent

Grey Serpent: Project STIGMA, activate

Kiana held Y/N in her arms, as he was slowly closing his eyes

Kiana: N-No no no! Not like that!

Mei: Y/N please! Keep up a bit! Renforcement will arrive soon!

Bronya: Tch! You!

She attacked Grey Serpent, who was killed in a second, ans turned back to Y/N as he spoke

Y/N: I'm sorry...... I let you all down in the best moment......

He started to cough, as he smiled at them

Y/N: You 3 are the best of us all......

Mei: N-No.....

Kiana: C-Come on! It's not going to end like that right?! You're going to get up and laugh it off right?!

Tears falled on Y/N face, as he smiled

Y/N: You're on your way..... Just keep going......

His arms went limp, as Bronya, Kiana and Mei's eyes widened

Death of Y/N L/N: 3rd March 2018

Chapter 15: Finished

In the final chapter, the ending of their story

'Final Chapter: Their happiness'

???: You can do it Y/N, you're my son after all