A Certain Scientific Railgun

As the local bathhouse comes under threat of being closed down, Mii enlists the help of Mikoto, Ruiko, Kuroko and Kazari to help promote interest, coming up with a Mikoto-powered 'electric bath' to bring in more customers. At first, the baths become a success which attracts the attention of Erii, Mitsuko, Wannai, Atsuki, Yomikawa, Tsuzuri, Komoe, Shizuri, Frenda, Saiai, Rikō and the Dorm Supervisor. However, the baths are almost ruined after Kuroko adds too much bubble bath soap in one of her schemes to seduce Mikoto. After the customers go home, the girls celebrate by having a bath and drinking milk.