1 Prologue

"Why the moon look so beautiful today? Why I hear screaming everywhere? And where am I actually.."

As he looks around his surrounding, suddenly a sword swing right to his neck along with a thunderclap. He manage to avoid it, but another one is coming right behind him. This time, the one who assault him is a dual-sword wielder. Trapped between these two from back and front, he decide to defend himself instead of avoiding the attack.

Then he saw their faces and asked "Who are you guys? What's your goals?"

"You really don't remember us huh?" said the dual-wielder. "Don't say unnecessary things now, we're going to finish him off."

"Couldn't care less about me yeah? Fine I" ll just kill both of you." Both of the hunters keep their distances away from him as they feel his killing intent is a real deal.

"Wait, what did i just said to them? Why is my heart so painful?" speak the Demon King to himself.

"We swear on her grave that we're gonna avenge her, no matter what might happened to us." said the thunderclap one.

"And we had a promise with another one too, to make sure that you rest in peace while you have no idea who you actually are, Demon King." said the dual-wielder.

"Promises? Memories? Don't have any idea what both of you talking about." said the Demon King.

"That's good then, we can finish you without hesitation, Demon King, no... Tanjiro."

Suddenly the Demon King become quite.

"Tanjiro.. somehow that name looks familiar to me, does he mean that I am Tanjiro? Wait, actually.. who am I to begin with?" the Demon King speak to himself and decided not to fuss over it.

"Tanjiro? never heard about the name, it's funny that you have mistaken it for me, the Demon King.

"So even you don't remember Nezu..."

"Quiet Inosuke! He's not the man we knew anymore, have you forget you just mentioned the promise a while ago?"

"That's right, we don't have time to reminiscing that good old days now."

Demon King gaze becomes more and more intense as his murderous intention grow stronger.

Both side didn't move for a while, carefully looking each other to find a good momentum for an attack. They got so focused that it seems like the people's screaming, the blazing fire that burns down the building, the corpse around them along with limbs part and blood rashes didn't exist in the first place.

The moonlight started to gone, even so they still focused at each other and manage to see, because they have learned the "See Through World" technique, even if it's not that clear to see for both of the hunters.

After the moonlight gone completely, they began to dash at each other, fighting for their own goals, to avenge and to survive, to kill or be killed, and the most important thing, this fight where Inosuke and Zenitsu stake their life, were meant to protect the bonds that once they had with Tanjiro long ago.

This is a story about the Demon Slayer Corps that once again had to fight against the catastrophe and the reality that couldn't be more cruelty because right now, they have to put an end to their own mate lifes. The mate that they trusted their back for, the mate that always nagging them every time they made a silly mistake, the mate that always stand beside them no matter how hard the situation is, the mate that once were everything to them.