Haruto Hayase was a normal high school boy in his third year, living a quiet life until his younger sister, Haruka Hayase, joined the same school.

Haruka’s beauty and charm made her the center of attention, quickly becoming the school's prima donna.

But when a notorious gang leader set his sights on her, he did everything in his power to protect her—only to fail tragically.

Haruka was brutally assaulted and tortured, and Haruto himself suffered an agonizing death.

However, in a twist of fate, Haruto is given a second chance, waking up a year before the events that shattered his life.

Armed with the mysterious ‘Debauchery System Slave’, he vows to exact revenge on those responsible.

This time, he will use his newfound powers of the system and charm to seduce the loved ones of his enemies.

From their mothers, sisters, and lovers to their closest friends, Haruto will make them his.

His enemies will suffer as he steals what they hold dearest, ensuring their downfall in the most devastating way possible.