What would you do if your favorite pet turned into a human being and offered to "mate" with you...!? Himari's boyfriend is competing for her affections with her pushy yet adorable pet cat!! Akito is Himari's former home-tutor and currently her boyfriend. But, he won't make love to her at all... As such, Himari spends her days depressed and holding her dear pet cat Leon. Then, on one such occasion, Leon turns into a guy with a wild side to him! He pushes Himari onto her bed, saying, "I'd never let you feel such loneliness!!" After that, thanks to Leon's transformation, Himari's relationship with Akito takes a major turn...!!