The episode centers on a trip to a massive indoor pool resort within the demon world. While it serves as a typical fan-service showcase, the narrative focuses on a sudden change in Naoya's behavior.
: Naoya begins acting strangely, showing signs of extreme irritability and physical exhaustion, which the characters jokingly refer to as "harem sickness" or frustration. Astarottes Toy Episode 9
: Shows genuine concern for Naoya’s health, further cracking her "man-hater" shell as she realizes how much she relies on his presence. The episode centers on a trip to a
