"Building a Slave Harem in a Labyrinth of Another World"

A story about a man who thought he was playing a game but ended up being transported to another world. He struggles using cheat settings in a game-like world with dungeons. That world is a society with class distinctions and slavery. Given that situation, there's only one thing to do. This story contains elements of an arrogant protagonist, overpowered strength, a harem, sexual slavery, and includes deaths of characters.