(COMPLETED) Giyuu is worried. All her life, Shinobu has been searching for her sister's killer. A certain Upper Moon 2. Douma. However, her madness escalates to the point of pushing everyone she loves away, including him. Everything falls apart once she stares face-to-face with Douma himself. As a person that has experienced loss more than once, he does everything he can to pull her out of her own insanity. He couldn't let her end up like him. Emotionless, alone, and most of all, empty.

It's 1915, and the Demon Slayer Corps is attempting it's biggest operation yet. Giyuu Tomioka is hell bent on killing Muzan, as he is now the leader of the corps. However, as Giyuu continues his hunt for Muzan, men from different states, customs from other cities, and weapons from different cultures collide in a bloody battle for Tokyo. With the love of his life on his side, and a boar-headed freak on his other, Giyuu must learn to adapt the role of leader and conquer the demons once and for all.

Giyuu lay dying on his 25th birthday recounting all the good times he spent with his friends before and after the final battle with the demon king and his servants. Yet, as he takes his last breaths and finally finds solace in the life he's lived, he is mysteriously transported back a whole 8 years in the past. Now faced with a second opportunity to correct his mistakes and save the lives of those he felt indebted to, what would he do? -Certain character ages may be changed for the sake of the story (specific birthdays will be explained later). -Manga spoilers (why would anyone read a fanfic about the end of the series if they didn't finish the story)