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...
There's a cave in the mountains out 
back! No one'll find him there!
!ثمّة كهف في الجبال الخلفيّة! لن يجده أحد هناك
Auf dem Berg hinten raus ist ’ne Höhle!
Da findet ihn keiner!
Hay una cueva en las montañas,
¡ahí nadie lo encontrará!
Hay una cueva en las montañas,
¡ahí nadie lo encontrará!
Y a une grotte en montagne pas loin,
qu’on l’y cache !
C'è una caverna nelle montagne qui dietro!
Nessuno lo troverà lì!
Há uma caverna nas montanhas nos
fundos! Ninguém vai encontrá-lo lá!
В горах есть одна пещера,
где его никто не найдёт!