Item Cheat na Dorei Harem Kenkokuki

Summary

High school student Rindou Shouma was summoned to the other world, Astral, where duels called "Oracle Game" decide everything. However, the rules of the card game were exactly the same as a card game Shouma was already good at! At that point, undefeated Shouma decided to create his own paradise full of liberated slaves. Creating a harem kingdom with the power of cards, this is the independence of a slave harem with item-cheating! (Source: Hobby Japan)