Dungeon vs Dungeon Eaters

This is the first appearance of Dungeon Eaters.

Beforehand
After Keima beat Isam in their duel a suspicious merchant gave 2 tubes holding Dungeon Eaters to the depressed beastkin. On that night he released them in the dungeon.

In the Dungeon
Dungeon Eaters eat the dungeon and its functions. Because of them, Rokuko fell ill. Nobody knew the answer, so Keima went to the Flower Garden of Light and asked Core 219 what should be done but she didn't know either. Keima asked her to {Teleport} to the Imperial Capital and ask Haku about it.

After Keima came back, Rokuko felt worse than before. As they discovered the cause of the illness the Eaters, Keima collapsed. He was connected to the Dungeon so the dungeon was failing as was he.

Ichika and Niku beat one of the Dungeon Eaters, but the other was still lurking in the dungeon.

After Keima recovered and dived into the dungeon they crossed ways with Isam who didn't want to let them through. Keima used his new magic {Elemental Burst} and knocked him out.

They found the bigger Dungeon Eater that was going for the Dungeon Core. They managed to fend it off but the giant leech was pissed off so it went for the Suzuki wall. There they were fighting with it Keima using his magic, Ichika using the Daiframe. After the bug was cornered it summoned monsters with Dungeon Points. But Keima mercilessly used his ultimate magic over and over again stealing back the dungeon's functions, until the artificial monster died and Keima was dyed in a black mist.

Aftermath
Keima killed himself because as he was a Soldier of God he could have stolen the dungeon's power as an Ultra Skill.

After Keima's suicide Rokuko felt better.