A guy gets transported to another world and does the best he can to have a good time.
Not a lot of action, but maybe some happening around characters other than the MC. A few dumb heroines, but not a harem. Dungeons, and deep ones too. None of the '1 floor a day' BS, my MC will be going quick because some dungeons have hundreds of floors. Wild monsters, but they won't play a big part. Slavery, but not for harem making. Can't think of anymore tropes right now.