Bet she just ate the real stage 1 boss to take her place.
I hope it's someone cute like Rumia-san!Stage 1 Boss FrameIs-Did you eat something strange, Yuyuko-sama?Is that so?Ah yes... The way she says "Is that so?" or something like that...I have to practice!That's true...first, there is the Stage 1 boss...GaspSpeaking of investigating incidents, I wonder what kind of youkai will stand in our way this time?Is th-...Kind of cute...