The Hidden Dungeon Only I Can Enter (Light Novel) Vol. 2

As a full-time student and adventurer, Noir spends his days fighting monsters, studying for exams, and flirting to power his special skills. Whenever he can, he returns to the hidden dungeon to continue his secret training. But something unexpected awaits him on the dungeon's seventh floor--a vast forest, a young girl named Dryade, and the monster who wants to devour her!