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.
Did you write this, Sayuki-senpai?!
Hast du den geschrieben, Sayuki?
¿Tú escribiste esto, Sayuki?
Sayuki-senpai, você escreveu isso?