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.