The youngest son of the Shin family, Shinhou, has idolized Shousei, his childhood friend and mentor, since he was young. He vows to become the strongest in the Shin family and win against Shousei, the strong, beautiful, and dignified figure he admires and trusts. However, their families’ conflict forces them to turn their blades against each other… Shinhou, under orders to exterminate the entire Shou family, refuses to fight Shousei—the person he loves and cherishes most—and allows him, the sole survivor, to escape. In doing so, he chooses to part ways from the path they once walked together, knowing they will never meet again. Fifty years after their separation, Shinhou returns to his family home following his father’s assassination—only to find Shousei, whom he thought he’d never see again.

As a member of the discipline committee, Akira makes a round of the school every day after class. Even though he'd planned on going home after a quick check, his finding Mitsuru, another second year, coming out of an unused room completely changes his life. Learning that, out of boredom, Mitsuru calls other students to empty classrooms after school to do naughty things, Akira warns him to stop before he ends up getting in trouble. But not only does Mitsuru not heed his warning, he gets even wilder… Can this naughty and twisted friendship develop into something more?

By coincidence, college student Morimoto reunites with his former teacher, Jinno. After having a meal together, Jinno is touched by Morimoto's home cooking, and they end up eating together almost every day! However, sometimes when they're enjoying their meals, Morimoto will have a sad look in his eyes. Jinno may have forgotten, but he'd dismissed Morimoto's confession in the past…