As the protagonist in the world of One Punch Man, Saitama can kill all enemies with one punch. However, as a "hot-blooded young man" who traveled through time, De Jong did not want to be hot-blooded. However, as the younger brother of an undocumented knight, and the hot-blooded youth system, he was forced to embark on the road of becoming the strongest hero as the protagonist of a hot-blooded young comic.
Of course, thighs are essential.
Can a person who is not much stronger than ordinary people, with the support of the system and blood, really be able to surpass the tornado, the explosion, and even the king who is known as the strongest man on the surface, and become the strongest hero?
What was waiting for him in the deep underground?