Doujin game inspired by ONE ~Kagayaku Kisetsu e~. Contains three separate stories with three different protagonists: "Stay.": Nagamori Mizuka tries to cope with Kouhei's sudden disappearance. "Before it turns into a memory": Kawana Misaki tries to find out what happened to Orihara Kouhei, with the help of Kouzuki Mio and Miyama Yukimi. "Sweet": Orihara Kouhei and Satomura Akane enjoy their daily life as boyfriend and girlfriend.