Hensuki: Are you willing to fall in love with a pervert, as long as she's a cutie?

Operation: Keiki is a master now!! (1x9)

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The Cinderella panties have gone missing, prompting Keiki to step up his investigation. As a first step, he decides to spend a day with Sayuki - on a date, not as her friend or kohai, but as her master.