After saving up enough money from their part-time jobs, Satomi "Sato" and Hinako decide to visit a local inn. Reserving a room with a hot-spring bath, the two of them begin to unpack and chat about their trip. When the topic of them being a couple suddenly arises, Sato asks Hinako to get in the bath with her to take her mind elsewhere. From there, things begin to escalate quickly to something much more passionate. [Written by MAL Rewrite]