When Karin becomes handsome Kiriya's object of affection, she wonders if she can truly deal with the consequences. Upon learning that Kiriya asked Karin to be his girlfriend, Karin's schoolmate Yuka bullies her and pushes her down a stairway to depression. Later, Kiriya asks Karin to go on a trip over their summer …
Karin and her friends begin preparations for their trip to Okinawa, and Kiriya's past slowly unravels after his father forbids him to go on the trip. Karin and Kiriya's relationship blossoms, but intimacy rises to the surface of their turbulent sea of young love as the pressure to give in torments romance newbie Karin.
Karin and Kiriya's relationship is in jeopardy after a heated argument during Club Day at Kiriya's school. The following morning, Karin gets wind that her rival Yuka went on a group date with members of Kiriya's class, but Kiriya isn't talking. Is Kiriya cheating on her? But despite Karin and Kiriya's romance blowing …