Tachibana Junichi is a boy from class 2-A. One day walking home, he saw by accident a girl's "underwear." Afterward, he finds outs what it really was...

Based on the Amagami love simulation game. The focus is on Tachibana Junichi relationship with Ai Nanasaki. The second arc focuses on Morishima Haruka. The third arc focuses on Sakurai Rihoko.