Saikin, Imouto no Yousu ga Chotto Okashiinda ga Temporada 1 Episódio 6

Yuuya is left confused by Mitsukis unstable attitude. He doesnt really understand the girl with wings (Hiyori) that he keeps seeing from time to time either. Meanwhile, thanks to her chastity belt, Mitsuki was extremely depressed from the embarassment of getting caught in it.