Azur Lane: Demon Slayer

Tanjiro is the Protagonist in the anime Kimetsu no Yaiba or Demon Slayer, he have a sister who become a Demon named Nezuko, the reason why he joined the Demon slayer Corps is to find a Cure that can bring Nezuko back to Human

After the Final Battle against the Main Atagonist of the Anime with the Great Lost, Kibutsuji Muzan, Nezuko have been cured and everyone else don't have to fight anymore. Tanjiro survived but lost his right Eye and his Left Arm but it's okay to him, he continue to live peacefully in the next 9 Years until he died because of the Demon Slayer Mark

Everyone thought that he will incarnated into his Future Relative, Kamado Sumihiko, but no....Everyone didn't know that he will have a New Life in another world