Takeo Gouda is a first-year high school student. Clocking in at 2 meters and 120 kilos, Takeo is a socially awkward hothead who's straight as an arrow. One day, he saves a high school girl from a groper on a train, and falls in love with her the next day when she comes by to thank him. But he believes that she must have fallen instead for his best friend with model-like good looks.

Takeo and Rinko finally meet alone. Although Takeo had thought that Rinko just wanted some relationship advice for approaching Makoto, Takeo is taken aback when Rinko starts crying.

Makoto's older sister Ai is shocked to learn that Takeo is dating. Having secretly harbored feelings of her own for Takeo, Ai is suspicious of Takeo's girlfriend and launches her own investigation...

Rinko's birthday is the same day Suna's father is scheduled to undergo surgery. Takeo tries to honor Suna's wishes by following through with his and Yamato's birthday date, but Takeo can't stop thinking about Suna's plight. After much thought, Takeo decides to tell Rinko.