Bell and Ryu trapped twenty floors deeper than they should be while their party races to save them, this is where the show finally stops playing around with dungeon crawling as setup and makes you believe people will actually die down here. Ryu's backstory doesn't exist to soften her character; it's a pressure cooker that explodes into the best combat sequences the series has ever made. The gap between what the separated groups are facing is so wide that every floor they descend together feels like they're running toward a funeral instead of a rescue.

Bell falls into the depths of the dungeon, wounded, short on equipment and cut off from his party, a disaster his companion Cassandra had already foreseen. With only Ryu at his side, who is in the same situation, he must survive the 37th floor, a Deep Floor full of strong monsters, while avoiding the Juggernaut, a creature far beyond their abilities. Their best hope is to reach a monster-free point even deeper down. Meanwhile, the rest of the party, up on the 27th floor, must face Amphisbaena, a floor boss that has respawned ahead of schedule for no clear reason. They need to defeat it in order to save Bell. The dungeon proves more cruel than ever as both groups fight to stay alive in this second cour of the fourth season, a fantasy action adventure with comedy and romance.