: Naoya begins acting strangely, showing signs of extreme irritability and physical exhaustion, which the characters jokingly refer to as "harem sickness" or frustration.
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. Astarottes Toy Episode 9
: It is eventually discovered that Naoya is suffering from a "mana deficiency." Because he is a human living in a high-mana world and is constantly around succubus energy, his body is under intense strain. : Naoya begins acting strangely, showing signs of