異世界迷宮でハーレムを (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: Michio wakes up in a different world after creating a game character on a dubious website. However, when Michio discovers the "slave" system in that world, he sets off on an adventure to live the harem life of his dreams, using the skills he acquired when setting up the game!

(Translator: DeepL)