Demon Slayer: I Am the Eldest Son of the Butterfly Family

[Transmigration] + [Fanfiction] + [Making things right] + [No angst] + [One heroine] + [No breaking up established couples]

I transmigrated as a baby, but why am I by a river?!

A new account! Don't mess with me!!

No way. Am I, a transmigrator of all people, going to spend my short life in these desolate mountains?

No way, I can still make it!!

Butterfly Abyss wailed at the top of his lungs, and sure enough, someone found him and took him home. But a voice in his mind told him this was the world of Demon Slayer, where demons existed.

Butterfly Abyss calmly said, “I don't care if you're a System or the mother of Blue Star. Please, save this child! Surely you don't want me to have a hard life out here...”

The voice in his mind went silent for a moment, then left three glowing orbs in his mind.

Heh heh heh~

Kibutsuji Muzan, who was posing as a human out in the world, inexplicably broke into a cold sweat.

Was that sweat? No, wait!