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Sanada, a dull middle-aged man living alone, picked up a kitten three years ago. Since then, he has kept her as a pet, Karin. However, the female cat's true identity is a yandere cat monster who can't stop loving her kind owner. One day, when Sanada comes home smelling like a woman, Karin's jealousy burns, and her love and lust run wild... The jealous female cat is in heat 24 hours a day! She will keep her owner's attention until her sexual desire dries up...