So, two or three years ago I was watching some anime, I remember the was an X in the name. It was about a guy who was playing an mmo, and some girl approached him and asked for help. He agreed, and got transported to another world along with a chair he was sitting on. He met a little girl pricess with her knight and a green-haired maid, who was really a guy. The princess was chased by some ikemen knights, and they had tanks and shit (I think). And the MC had some power and fought the knights on several occasions, and often won by kicking them in the balls. And there was a beach episode where the trap maid was wearing a bikini and was very popular, and an episode where one of the leader of the knights (the one who got kicked in the balls a few times) visited his fiancee and was worried since, you know, balls.