Invisible Man: Rail! (1978)
1978A horny scientist who is married to a hot wife and lives with his virginal step sister invents a drug that can make him invisible. Erotic high jinks ensue.
Actors: Yuki Yoshizawa
Hoteru hime (1993) aka Burning Princess
1983A wife cheats on her pilot husband while he is out flying planes. She screws her lover while wearing her husband’s pilot hat and comes to a swinging party with him.