As a child, Masamune Makabe once suffered greatly at the hands of a wealthy and beautiful girl named Aki Adagaki, who nicknamed him "Piggy" due to his chubby appearance. Seeking revenge against his tormentor, Masamune works hard to improve himself and returns as an incredibly handsome, albeit narcissistic, high school student. When he encounters Aki once again, he is prepared to exact vengeance. With the aid of the rich girl's maid, Yoshino Koiwai, Masamune slowly begins to build his relationship with Aki, intending to break her heart when the time is right. However, as his friendship with Aki begins to grow, Masamune starts to question the objectives of his devious plans, and if bringing them to fruition is what his heart truly desires.
Masamune and Aki's class goes to France for their school trip and there, they meet an aspiring manga artist named Muriel.
Aki tells Masamune about her past, but Masamune realizes that somehow, they remember a pivotal moment in their lives very differently.
Gasou tries to get closer to Aki, and Masamune confronts Yoshino about something.
Yoshino tells Masamune exactly what happened in their past and then convinces him to stop Gasou from getting too close to Aki.
Masamune interrupts Aki and Kanetsugu's date by saying he's the Masamune Aki had met 8 years ago and ends up asking her out. Surprisingly, Aki ends up saying yes and the two formally become a couple, but Masamune can't help but feel conflicted…
Masamune and Aki go on their second date on Christmas Eve, which happens to be Aki's birthday as well, but...
After ruining his Christmas Eve date with Aki, Masamune tries to get some answers as to why he keeps breaking out in hives around Aki.
Masamune helps Yoshino after she sprains her ankle, and Aki meets with Gasou.
Valentine's day is on the horizon and Yoshino offers to help Aki with making something for Masamune. Afterward Aki and Masamune go out on a date.
Aki invites Masamune out on a White Day date but it ends up going in a very unexpected direction.
Masamune has had a series of absences from school, so Yoshino decides to check in on him after school. Chinatsu reveals that he's left and is staying with their grandfather in Shinsu.
What is the ultimate fate that awaits Masamune, Aki, and Yoshino?