Most people have a secret they just can't tell others. In my case, I have two. One is there's someone I like. And the other is... I am crossdressing while attending an all-girls' high school.
I, Mizuki Saiki, have an older twin sister named Miyuki: and to suit her own purposes she is practically forcing me to crossdress, so that I can attend her all-girls school as a female student in her place.
"But this way, I can stay together with my beloved childhood friend Kaya-chan... as long as I don't get found out!"
Desperately trying to hide the fact that I'm a boy amidst nothing but girls... A comedy about a heart-pounding mission that's swirling with ulterior motives!
(Source: Square Enix, translated)