Shougo is an ordinary if somewhat lazy university student. Instead of studying he prefers to hangout with other regular visitors in a place called the Cubic Cafe. Several years ago his girlfriend Kanata suddenly left him, disappearing without a trace and giving him no message on why she ran off. One day, completely by chance, the two happen to meet each other again in that cafe.

The story takes place in summer, a year after the events of Memories Off 2nd (Memories Off 2nd)