Body Jack: Tanoshii Yutai Ridatsu
Genres: Comedy, Ecchi
Type: OVA, Episodes: 1
Aired: Jan 28, 1987
Source: Original
Rating: R+ - Mild Nudity
Synopsis:
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.

(Source: ANN)