Rape Ceremony (1980)

In a rural town, ex-members of a motorcycle gang become sporadic victims of a vigilante attack. A group of high school boys are responsible for the various assaults because they're upset that the motorcycle gang had disbanded. Seemingly, these kids idolized the rebel gang and harbored dreams of joining them after graduation. Female student Miku (Megumi Saki) happens to see one of the vengeance assaults, and is threat-ened by the high school thugs. After getting raped, she soon develops a compassion for the wild boys.