Kosaku Urano studies at Heian University as an Astrology Club member alongside sisters Kocho and Koran Enoki. He serves as a human decoy during supernatural encounters with hostile spirits, deliberately attracting their attacks to protect others. His personality features genre-typical comedic elements, including frequent nosebleeds provoked by suggestive scenarios and a persistent lecherous demeanor. Koran Enoki habitually clings to him physically, causing visible irritation for Kocho Enoki and ongoing interpersonal tension. Urano consistently breaks the fourth wall, delivering introductory narration that frames the story's premise. His conduct and reactions primarily fuel the narrative's raunchy humor through nudity and sexual innuendo.