可愛ければ変態でも好きになってくれますか？

Keiki Kiryu, a high school student who just wants a normal girlfriend, finds a love letter in his locker, attached to a pair of underwear and signed by no one. Determined to identify the sender, Keiki investigates the girls around him: his studious senpai Sayuki Tokihara, his kouhai Yuika Koga, classmate Mao Nanjo, and even his own sister Mizuha. Each turns out to harbor an unusual fetish, and Keiki's straightforward search for romance spirals into something far stranger than he bargained for.