Juuma to Tsukuru Isekai Dungeon

Juuma to Tsukuru Isekai Dungeon cover

One day, Nagayuki Karasumaru discovers that his closet contains a cavern linked to another world. In that cavern, he finds small creatures on the verge of death. Upon saving them, Nagayuki notices he has become a dungeon master. (Source: Square Enix, translated)

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