After ten years, cousins Ken and Tomo—now with a matured body—reunite during the holidays. They hit it off and commit the forbidden act, but little do they realize that it was observed by Ken's devilish little sister, and the lengths that she'll go to to prevent their love from blooming further...

After graduating high school, Kenji decides to return to his hometown in the countryside in hopes of finding out why Tomo had left without a trace nearly a year ago. But much to his surprise, Tomo seems to be doing well despite hints of something darker lying beneath the surface. But as all things tend to happen in the summer, Kenji takes the plunge and confesses his feelings to Tomo -- a reply that she had been waiting to hear since she first confessed to him as children.