: The episode is noted for its high-quality animation during the pool scenes, featuring various main and supporting characters in themed swimwear. Production Credits

: Shows genuine concern for Naoya’s health, further cracking her "man-hater" shell as she realizes how much she relies on his presence.

: As Lotte's head lady-in-waiting, she continues to push for Naoya to fulfill his "duty" to help Lotte survive, using his weakened state as a catalyst for their bond.

Episode 9 of (Astarotte no Omocha!), titled "Slight Fever Backslash," is widely remembered as the "swimsuit episode," blending the series' characteristic ecchi elements with a rare moment of emotional vulnerability for the protagonist, Naoya Tohara. Episode Plot Summary

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.

For a deeper look into the series' reception and its place within the isekai genre, check out this retrospective analysis: