15-year-old Akira Takahashi who lives with his dad and just started high school, decides to muster up the courage to tell his first and only love who's also his next-door neighbor that he's had feelings for her for as far as he can remember, but Tanaka Michiru declines, saying that she loves someone else. Akira gets curious about who this new person in her life could be. Little does he know that a huge surprise awaits him.