18+ 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…