Haruka is suddenly summoned to another world along with his classmates where special skills are first come, first served. He gets the skill "loner."

Tanaka reveals his true evil side. It's all Haruka can do just to avoid getting hit, and things are starting to look bad.

Haruka overhears delinquents misusing their skills.

His classmates are adjusting well to their new lives as adventurers, but Haruka still wants to get back to his life alone in the woods.

While Haruka and Angelica are conquering the labyrinth from the bottom to the top, Meliere appears in front of the committee chairman and the others who are progressing from the top to the bottom. Then, she learns of the fact that the threat of a stampede is approaching the city of Omui, and how to stop it.

After getting word about the stampede headed for town, Haruka makes haste in escaping the dungeon.

After stopping the stampede, Haruka and her friends return to Omui town. The girls in the class go to the bathroom together to get closer to Angelica, but when they take off their armor, they find a bare leg for some reason...

Life together with rambunctious girls is a little awkward.

Haruka encounters the jocks. They tell him how they've kept an eye on the delinquents and that someone has a terrifying OP skill called "Hijack."

After saving Merielle, Haruka is paid a handsome sum and granted ID which allows him to freely leave town.

After arriving in the town of Omui, the group heads for the Adventurers Guild. Haruka, however, is not a high enough level.

The last boss, the Dungeon Emperor, awaits Haruka in the deepest depths of the dungeon.