"It's a promise" •GenMui•

This is a kny au where it takes place hundreds years after Muzan was defeated. Genya suddenly wakes up from an odd dream where it took place in the Taisho era.. Could it be memories of his past life?

Author's note: Hi sorry if this story won't make sense, or grammars are wrong but Im trying the best I can:')) Also in this Au the charcters will have the same names as they're ancestors, and aswell also related since they were all reborn to the modern world. Sorry if the au doesn't really make sense-

Also cover not mine, ctto