Sena Riri is a beautiful high school gal. She was my childhood friend but we became estranged due to a certain game. Then, one day, when I returned home, she was standing in front of my house. "Let me come up to your room, Yuto, for the first time in a while." Then, out of nowhere, she suggested that we play that same game again: "H-play." The rule was to touch each other's lower bodies and whoever could hold back longer won. Why...? Didn't Riri hate me because of that...? My mind was replaying the past but facing Riri's grown-up body, my lower body pushed forward —.