Mom i'm home now ..... oh what's with that bruises did your classmates bully you again? it's nothing mom i just fell go eat dinner already and i'll go prepare some medicine. after eating dinner and treating his wounds shoto go to his room and ask his self why am i so weak? if only i can become stronger his dad is called a hero in their country because his dad participated in the subjugation of a black dungeon dungeon is divided by 6 groups red,black,blue,yellow,green,white(strongest to weakest)black dungeon is considered as an A+ dungeon since his father is the leader of their raid team his father bare the lives of his subordinate they manage to subjugate the dungeon but with great casualties saving the lives of his comrade his dad did not manage to return since then shoto's life became miserable people must train until the age of 15 so they can see the fruit of their training because in the age of 15 your body will stop absorbing mana and you will harvest your hardwork ofcourse there are also people that is genius since birth but without hardwork they can't grow stronger since shoto is a fan of the number 3 hero called Ragingmuscles day by day he train his body and his mind because he know's thats the only way he can keep up with those geniuses.