Tobio Masubuchi, content with his ordinary life, yearns for a future filled with joy and longevity. Together with his close pals Sho Isami, Yuki 'Maru' Maruyama, and Hidero 'Paisen' Kosaka, they navigate each day carefree and unrestricted. However, a casual remark by Maru attracts the attention of troublemaking students from a rival school, leading to a harrowing ordeal. After a brutal attack leaves Maru in a dire state, Tobio and his friends are determined to seek retribution. What starts as a vengeful prank escalates tragically, shattering Tobio's desire for a peaceful existence.