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

Cinderella Dropped Her Panties?! (1x1)

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Keiki Kiryu is a kind-hearted high school student surrounded by attractive girls. One day, he finds a love letter with no sender information, other than a pair of panties. Keiki begins his investigation by speaking to his senpai, Sayuki.