Whirlwind Adventure! Gyoblin Castle

Synopsis

Kosuke and the others already overpower the rest of the students, so for their first lesson they take on the special dungeon "Gyoblin Castle." With Ryudi, who can use intermediate magic, and Yukine and Nanami tagging along as supervisors, it seems like a rock-solid team, but inside awaits a series of horrifying lotion traps like nothing they've ever seen...