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.

After Sayuki, it's Yuika's turn to reveal her true nature to Keiki. Our hero is now targeted by two girls and still has no idea who Cinderella may be. Between domination and servitude, will he find love?