Sora, a man who was asked by the beautiful director Reika Mikage to become a subject of a new drug, accepts it and moves to a special ward. It seems that the sky does not float a little when Reika tells Yu Yagami, the nurse in charge, to leave the sky for a while because of the work of the main building. Even though he became a subject, the sky wandering around the hospital found Hiyori Kisaragi, a nurse who was enthusiastically looking at the computer monitor in the library. It was the sky that approached Hiyori and called out, but I was watching an adult video rather than Hiyori. Then Hiyori tells Sora, I want you to go out with my experiment. I decided to go out with the experiment in the sky, which I had no reason to refuse. By all means, it's just a kid. Still, it has a strange sex appeal ...