The appraiser Ein is exploring a dungeon with his party, who keep mistreating him and call him "trash picker." As they venture further, they get swarmed by a pack of strong monsters called Hell Hounds. In order to survive, Ein's party members Zoid and Jolene betray him and leave him behind as bait, dooming him to a certain and painful death!

Ein manages to survive his plunge thanks to the help of a mysterious power, but even greater dangers await him in the depths of the dungeon. Can he master his newfound abilities and attempt to make an escape?

With the artificial spirit eye that Yuri bestowed upon him, and with Ursula's training, Ein has gotten stronger. When he sets his sights on reaching the surface, Yuri asks him to take her with him. To that end, Ursula further enhances both his eyes, and they are ready to leave. That's when Yuri asks Ein a certain question...

In search of Yuri's sisters, Ein enters a dungeon that Jasper told him about. This hidden dungeon is just full of traps. But what is Zoid doing here?!

Pina and Kurohime join Ein. Soon after, guild master Meegan gives Ein an SS-rank quest to defeat the Behemoth.

Ein gains entry to the Forbidden Library of the kingdom. There he meets a girl with a surprising background.

Ein travels to Rayshik to fight demons, but once there, Lord Nigun claims no demons had ever been sighted.

Ein's will to protect the village is put to the test with monsters approaching and the true evil revealed.

Ein faces Shadow, but in order to defeat him, he would have to hurt Nigun. Is there no other way?

On the way to meet another spirit, Ein has to face two new threats from the demon realm, Hornet and Ioana.

Ein's latest challenge is to win Mei's trust. But then there's also a castle in need of cleaning....