Ep. 5: Moka worries Tsukune's interest in the swimming club endangers her vampire powers near water.

5

Tsukune develops a strong interest in joining the school swimming club, which causes significant distress for Moka. She reveals that water has a peculiar and dangerous effect on vampires, as exposure to it can rapidly drain their supernatural abilities. Consequently, Moka fears that Tsukune’s potential participation in pool activities poses a serious threat to her strength and safety. This situation creates tension as she attempts to manage his growing enthusiasm for the sport while protecting herself from the debilitating consequences of water contact. The episode highlights the specific vulnerabilities associated with vampire physiology in this particular setting.