The Hidden Dungeon Only I Can Enter manga volume 6 features story by Meguru Seto and art by Tomoyuki Hino.

At the invitation of his brother, who’s studying abroad, Noir heads off to the town of Honest with Emma and Lola. Instead of a relaxing vacation spot, they find a city being attacked by a swarm of monsters! They learn that this “Great Invasion” occurs regularly, and to his surprise, Noir discovers that the person behind this event is someone he knows very well.