Aliens from Outer Space are slowly switching places with real humans -- one of the first being a young man about to get married. Slowly, his new wife realizes something is wrong, and her suspicions are confirmed when her husband's odd behaviour begins to show up in other townspeople.

A scientist keeps his wife young by killing, stealing the bodies of, and taking the gland fluid from virgin brides.

Osamu Ino is a great doctor who is beloved in his rural village. His knowledge and dedication make an equally strong impression on his reluctant medical intern, Keisuke Soma. But, Soma and the villagers reconsider their opinion when they learn about a shameful incident from Dr. Ino's past. Now the once-respected doctor must account for his past actions.