Hensuki: Are You Willing to Fall in Love With a Pervert, As Long As She's a Cutie? S01 E09 Operation: Keiki is a master now!!

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.