Everything was great, since Muzan has legalized and created you Upper rank 0 among the Twelve Kisuki..

Until.. Muzan found out that one of his own underlings have sinned,in behalf of his words.

Now: You sit in the center of the Infinity castle, a detached demon arm settled beside you, as if you were eating it.It’s at this time that Muzan noticed that his own creation of a demon had a sort of a cannibalistic desire.. ”What have you done…”