chiramku: Sudojo Lucia: kegasu (1978) AKA SINS OF SISTER LUCIA (1978)

http://www.imdb.com/title/tt0287736/

http://www.dvddrive-in.com/reviews/n-s/sinsofsisterlucia78.htm

Rumiko (Yuki Nohira) was a naughty naughty young girl who stole her daddy's bribe money, had sex with her tutor, and stabs one of daddy's henchmen. Naughty naughty.

Well, get thee off to a nunnery! Sister Lucia is now just being obstinate. If she would just follow the rule, she might enjoy the games the other sisters play with each other, or maybe Mother Superior would share the Priest occasionally, But, no, she has to do it her way, and for that she will be punished.

She is sent to the correction room, where she is found by two escaped convicts. After the pleasure themselves with her, she conspires with them to have all the nuns so she can take over. After they have a half-dozen, they go after Mother Superior. Will the police arrive in time to save her from a fate worse than death? You'll have to see that for yourself.