My name is Keima Masuda. I'm a high school student around 16 years old, attending Meikyu High School's Dungeon Department.

My dream is to become a Dungeon Master, have monsters do all the work, and I myself get to sleep and live a life of leisure! I'd also like to casually run a dungeon for seniors in the countryside.

However, today, when serious Dungeon Studies classes were supposed to begin, I overslept. So, when the teacher said, "Alright, everyone, pair up!", I ended up partnering for a year with Rokuko, a girl aiming for the core who was all alone.

...Huh? You're from the legendary Yaminokami? And you're Haku-sensei's sister?! That makes you an elite! ...Wait, but your aptitude score is— She snapped, "Oh, I'm sorry, I'm just a failure anyway!" I quickly mumbled, "Ah, right, my bad."

A failure among elites, how typically heroine-like, I thought to myself. (My humble opinion.) Well, as long as I can leisurely be a Dungeon Master in the countryside, I'm fine with average. This is just right.

So, let's get along for the next year, partner.