Volume 2 (Manga)

Information
There are many magical caves in the world. Some of them are undiscovered, unexplored, and untouched. People called it "hidden dungeon". By making full use of the abilities inherited from the legendary adventurer Olivia who met in the hidden dungeon, Noru has successfully entered the hero school, which is said to be the most difficult. There, he meets Maria, the highest duke of the aristocratic class.