They were supposed to go on a cottage trip with their college friends. However, the only one who showed up to the meeting place was the unemotional Ogawa Chiharu. The others couldn't make it due to sudden illness, leaving them alone...! While Naoki is confused, Chiharu seems to be going at her own pace. Then, for some reason, they end up in the sauna together... Though she's cool and hard to understand, Chiharu actually has a slightly special feeling for Naoki... but Naoki is completely unaware. A thrilling, erotic little trip begins by chance?!