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 are now text pals. Takeo's heart skips a beat every time he gets a girly text from Rinko, but he believes Rinko has fallen for Suna and vows to make her dream come true.

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 fast approaching, and Takeo plans out their birthday date with Suna's help. Sensing something amiss with Suna, Rinko suggests inviting Suna to their date, but Suna says that he has something he needs to do that day...

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.

Takeo is over the moon over his new little sister, Maki. With Valentine's Day approaching, Takeo's heart is set aflutter again since he has never gotten chocolates from a girl who liked him in his life. He can't wait to see what Rinko will give him.

Every year, Suna has received an anonymous letter and chocolate on Valentine's Day. Every time, the letter says, "I don't need anything in return, but please like me." One day, Takeo senses a strange presence behind them, and meets the sender of the letter, Yukika Amami. After hearing about her longtime feelings for Suna, Takeo decides to help her!