Help?

I don't think it was yaoi. A group of people ended up in a castle in the middle of an ocean and the castle was a maze, the group was all males but with one crossdressing and the one crossdressing their uncle owned the castle. It was something like whoever made it out of the castle would be the new king. But something was wrong with the monarchy line like they were murdered or something cause the main chara was of the royal blood but shouldn't have been a part of the group. That's pretty much all i can remember