It's so funny that anyone can just walk into Himeno's family mansion without a problem. But that's part of the over-the-top humor of this anime. Like stepsister Mayune inviting another boy over to watch her shower, or the literal jungle in the mansion's garden teeming with wild creatures. In this episode, amidst all the hilarious absurdity, Himeno feels responsible for her young knights and tries to protect them.