Edel was taken in and trained by the Great Sage Ramirez in the Demon Realm. Before he realized it, he had become strong enough to thrive in that brutal world independently. At the age of twelve, Edel chooses to move to the human world. There, he encounters Maribel, the headmaster of a Hero Academy, and starts his journey as a student. However, it appears that the "common sense" from the Demon Realm is entirely off the charts compared to that of the human world...!? "I just did it normally, though." "That is NOT normal!!" Everyone inevitably plays the "straight man" to Edel as he showcases his extraordinary talents. The tale of a boy who defies all common sense begins his new existence in the human realm! Originally from "Shousetsuka ni Narou"! An other-world fantasy where a boy raised in the Demon Realm fully enjoys the human world at his leisure!