Vandra, a female vampire, inhabits a haunted castle masquerading as a tranquil summer resort. She fixates on the Norimaki and Soramame families, Suppaman, and Dr. Mashirito during their vacation, weaving the resort’s amenities—arcades, hot springs—into intricate traps to lure them into her domain. Her singular aim: to drain their vitality, sustaining her immortal existence through their capture. Though her origins and broader ambitions linger in obscurity, her schemes unfold entirely within the resort’s illusory facade. The narrative confines her presence to this setting, withholding elaboration on her history, vampiric traits, or ties to the series’ wider universe.