It happened one night in July 1977, when Japanese idol Nana Okada was only 18 years old. A bad burglar broke into Nana Okada's house, and threatened her with a fruit knife to be quiet. She tried to escape but got into a scuffle with the burglar, cutting her hand with the knife. The burglar tied her body up with a rope, and raped her repeatedly until morning.
The burglar wasn't identified and got away with it.