仲間の仇を探すための探知系アーティファクトを手に入れるため ダンジョンへとやってきた迷宮専門の冒険者・ウェイド。 貴族の指揮する探索隊とともにダンジョンに入ったが 巨大なドラゴンが行く手を阻み、探索隊は全滅してしまう…。 決死の覚悟でドラゴンと闘うも力及ばず致命傷を負ったウェイド。 しかし目を覚ますと傷は完治しており、そしてダンジョンマスターへとなっていた…!? ダンジョンに囚われた冒険者の迷宮防衛譚、開幕!!!! Wade, an adventurer specializing in labyrinths, has come to a dungeon to obtain a detection artifact in order to seek revenge for his friends.He enters the dungeon with an exploration party commanded by a nobleman, but a huge dragon blocks their way, and they are wiped out…Wade fights the dragon with determination, but he is defeated and fatally wounded. However, when he wakes up, his wounds are completely healed, and he has become a dungeon master…?!The labyrinth defense tale of the adventurer trapped in a dungeon begins!!!!
