Once upon a time, Cinderella left her panties in a boy's locker...wait, what?! Kiryuu Keiki receives a mysterious love letter, that has no name, but includes a pair of white undies. Curious to find this panty-leaving-Cinderella, his investigation leads him to discover that every candidate is...a total pervert! Surrounded by perversion he still has one important question to answer: who's the perfect fit?

[Source: Funimation]