RYUUYUU

Maou ni Natta node, Dungeon Tsukutte Jingai Musume to Honobono suruChapter 80.2
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Shounen

Before I realized, I had become the guardian of a dungeon, a Demon Lord. I was suddenly in a dangerous world with giant monsters loitering around, fighting for their existence, so I thought to go about developing the dungeon in order to not die but -