Tamotsu Saido, 22 years old, has been in love with his childhood friend Saki Takagi, 10 years older than him, who lives next door, for seven years, but Saki got married and left seven years ago, and Tamotsu has never been able to tell her how he feels. But seven years ago, Saki got married and left him, and Tamotsu has never been able to tell him how she feels about him. However, Tamotsu has a girlfriend now. He tries to take good care of her and tells himself to give up, but every time he sees Saki's smile, his heart can't take it anymore. ......?