Boushoku-Hi no Ken

After Dean, a third rate adventurer,

got surrounded by demonic beasts in the demonic labyrinth,

he fled to a place where he found the strongest demon who devours power:

The demon-fed sword Belzera, born to the Gluttony Empress Belzebuth.

After obtaining such unexpected power,

he once again aims to become a first rate adventurer he looked up to,

and delves deeper into the labyrinth. However…