On the night of the school trip, Ryo sneaks into the girls’ room by himself, planning to have his first kiss with his girlfriend, Hina. However, everyone returns to their room and the kiss is aborted. The two make a quick decision and end up hiding in the closet… Ever since their first experience on the school trip, Hina and Ryo have maintained a good relationship as lovers. However, there is one problem: Ryo wants to have sex inside the school. One day during club activities, Hina is suddenly called by Ryo to the gym storage room and asked for a favor…