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...
But they were mine, so that's 
not your problem, right?
لكنّها كانت لي، لذا ليست مشكلتك، صحيح؟
Aber es waren ja meine,
das braucht dich also nicht zu kümmern.
Pero es mío, así que no importa, ¿no?
Pero es mío, así que da igual, ¿no?
Heureusement,
ce n’étaient que les miennes.
Ma, siccome erano miei, 
non è un problema tuo, giusto?
Mas é meu, não há problema nisso, certo?
Но это мои конспекты,
 так что не страшно.