Saikin, Imouto no Yousu ga Chotto Okashiinda ga Temporada 1 Episódio 11

Mitsuki won tickets to a hot spring at a lottery, so she ends up traveling together with Yuuya as well as Nanami, Yukina, Ayaka, Neko, Torii, and his little sister. Once they arrive, the girls head straight for the outdoor bath, but Mitsuki wasnt feeling very happy.