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.
It's natural for a brother
to pamper his little sister.
Brüder müssen ihre kleinen
Schwestern verhätscheln!
Es normal que un hermano
mime a su hermanita.