What happens when a frozen girl, confined in Yubaba's room, melts? When there's a hidden rival company to the bath house? A new war is raging inside of the walls of the bath house, waiting for the right moment to strike.

Ikari is a female student that somehow enrolled herself into Samezuka. When her female identity is revealed, she becomes the responsibility of Makoto and Haru to help her transfer to Iwatobi. But when her secret is found out by Haru, their lives change indefinitely. Will they be able to swim across the oceans that separate them or will they drown? O.C and A.U!