A former corporate slave reincarnates into a fantasy world as a handsome young man named Akuro, born into a wealthy and loving family. Life should be perfect, yet he feels an inexplicable emptiness. That void is violently filled when bandits raid his home and sell him into slavery. During backbreaking labor under a cruel female outlaw leader named Meloa, he is subjected to punishment that unexpectedly awakens a dormant instinct: he is a masochist, and this trait manifests as a bizarre cheat skill. The more he is humiliated, beaten, or dominated by women, the more his health restores and his power grows. Embracing his nature, Akuro sets out on a quest to find the ideal dominant woman who can help him become a true hero.

His journey takes him from the slave camp to the kingdom’s knight order, where he passes the grueling entrance exam only to discover his magical aptitude is useless. Assigned to all-male sword training instead of the strict female knight captain Serene, he must prove his worth through sheer persistence. When a mysterious mountain appears and triggers a monster rampage, Akuro’s squad is deployed alongside his former mistress Meloa as a special ally. Later, disillusioned by the overwhelming strength of the hero Luchs, Akuro leaves the knight order and accepts a commission from a wealthy elf named Puris to retrieve a dragon-forged magic tool. The hunt pits him against the criminal Zoid and leads to a dragon’s lair where a wounded girl holds the key to his next transformation. Through every encounter, Akuro learns that even if he cannot become the greatest hero, he can still be someone’s champion.