Keiki Kiry finds a love letter with no sender information, other than a pair of panties.

Keiki's investigation finds that the senpai he looks up to is a huge pervert, but it doesn't stop him from moving forward. There are other suspects to question and he approaches Yuika, a cute and supportive student librarian.

Yuika reveals her true nature to Keiki, who struggles between the two girls and his mysterious Cinderella; between domination and servitude, he wonders if he will find love.

Trapped by Sayuki and Yuika, Keiki is rescued by Mao, but she blames him for spending too much time with other girls and their friendship may suffer.

Keiki's hunt for someone who loves him for himself, not as the object of a perverted fantasy, is thwarted once more. Another unsigned letter gains his attention.

Keiki tries to help Koharu get together with Shoma but starts to wonder if Ayano Fujimoto on the student council is the one for Shoma.