The universe begins with Demon Slayer: Kimetsu no Yaiba

In The universe begins with Demon Slayer: Kimetsu no Yaiba, the story follows Bai Yu, a time traveler who embarks on a journey starting with a demon-slaying sword in the world of Demon Slayer: Kimetsu no Yaiba. In a realm where ghosts feed on humans and humans hunt ghosts, Bai Yu forges contracts with spirits and deities, ascending beyond the realm of ghosts. This novel features a handsome male lead, a harem-seeking protagonist, and a male protagonist on a path from weakness to strength.