In the winter of his first year in high school, Maru Sueharu fell in love with Kachi Shirokusa, a genius novelist who happens to be his classmate. But since it was his first love, time only continued to pass by while he could do nothing. As his so-called friend Tetsuhiko chides him and his childhood friend Shida Kuroha teases him, he overhears his crush Shirokusa saying she has a boyfriend now. His heart broken before he could even confess his feelings, Sueharu is devastated. Then Kuroha proposes that they get revenge...
I told you, I just did that 
because I lost a game.
.أخبرتك، فعلت ذلك فقط لأنّني خسرت في لعبة
Noch mal … Das musste ich bei ’nem
Spiel als Bestrafung durchziehen.
Vamos, te dije que eso era un juego.
Vamos, te dije que eso era un juego.
Je t’ai dit
que je l’avais fait pour un gage !
Te l'ho detto, l'ho fatto 
solo perché ho perso a un gioco.
Eu te disse, fiz aquilo
porque perdi uma aposta.
Я же сказала,
что всё это было не всерьёз. 