Demon Slayer: Kimetsu no Yaiba fanfic, about the Immortal Kawa brothers, from the perspective of Genya.
In the modern reincarnation setting, all members do not inherit the memory setting of the previous life, but they will have the opportunity to remember it as the chapter unfolds.
It's just an ordinary day-to-day life of modern brothers and demon slayers.
Purpose: Deep brotherhood