"---If I'm with you" They start dating after graduating from middle school. Two years after their promise, Kusanagi-sensei and Ichihime finally become a couple, experiencing the excitement of "a long-awaited love" and the anxiety of "a first love"!? However, one day, Ichihime's mother, who is also Kusanagi-sensei's close friend and once had feelings for him, Yaee, catches them together――. A forbidden love story begins with an age-gap girls' love, leading to a bold finale!