閉ざされた淫欲の学園

In Kasumijima district, students on the way home went missing successively.
Nearby schools and police
called for attention, but the cases remained unsolved to provoke some curiosity among students.

And now in this evening time in an all-girl school situated in this district, there are: Yuki Kariya, a busty girl stayed late for student council activities, and Miyabi Oikawa, a small-breasted girl who took a nap in the afterschool time. One of the two girls becomes the target upon your choice.