Dr. Toyama takes control of the body of a beautiful girl with his strange invention. He lets the young Asagedani "slip into" her body so he can see how it real feels to be a girl. Then Komaba's classmate, the equally beautiful Nakano, surprises "him" and mistakes his activities for a sexual advance from her friend.
80s style, classic high-school triangle romcom with a supernatural tweak. But 60% or more is hentai material.
My score is about what's left and not very meaningful, sex being the main point here.
From someone whose interest lies there, to people interested in that part: "Oh well. The lesbian scene was nice."