Koyuri and Sei-chan are childhood friends who have lived in the same condominium since they were born. They grew up together, but they haven’t talked since she was bullied because they were too close and she decided to stop talking to him when they were in 6th grade. Now that she’s a high school student, she’s changed her mind and wants to fall in love and get a boyfriend...!? "Why is it so frustrating to be childhood friends...? Although you know everything, you know nothing at all." The one who is the closest, the one who is the furthest... The heart-throbbing opening of a youthful love story!