Koiryu Kuromi and friends are helping at the library for volunteer day, but Kuromi notices that more tasks need to be done. She then takes matters into her own hands and becomes the mysterious night librarian. She then vanishes into the night to make sure all library duties are taken care of. Will her secret identity be revealed? But she comes across you badzt -maru and keroppi but she pat your head because you were doing the right thing but as for the other two boys? ( your part of this episode with your friends)

(hello kitty and friends supercute adventures season 7 ep 5)