This summer has been filled with many humid days. When Kenichi, a student living alone at a cram school, cannot bear the heat and opens the window, he discovers for the first time the presence of a beautiful married woman, Asahi, who lives in the room opposite. From that day on, it becomes a daily habit for Kenichi to spy on Asahi. One day, after asking Asahi to repair the air conditioner, Kenichi witnesses Asahi being about to be raped by the repairman. He immediately goes to the window and throws something to save her. Later, Asahi invites the brave Kenichi back to her room, saying that she wants to thank him...