The Upper Rank Demons are the most powerful demons to exist in the Demon Slayer series and are the most evil under Muzan.

A breathing style created after the sun breathing, learn how this was created in the world of Demon Slayer and its relation ...

However, as the series progressed, the Upper-Rank Three Demon gained a following among fans ... kills himself. Kokushibo's reflection indirectly leads to his death in Demon Slayer (Image via ...

Demon Slayer is a series ... not killing Muzan and Kokushibo (Image via Ufotable) Yoriichi not killing Muzan and Kokushibo is one of the reasons he is heavily judged. Fans see it as a monumental ...