100 High School Girls: Secret Motel Report (1975)

Investigative reporter Hayakawa Junko visits a town that was once the scene of a scandal involving mass prostitution to cover the activities of high school girls at motels. What Junko sees there is a flood of sexual promiscuity among high school girls that is even more shocking than what has been reported in the media. During her investigation, Junko hears a rumor that it is a "high school version of Romeo and Juliet," in which two high school students, Ryuichi and Yuki, fell in love but their families opposed their relationship, so they cut off each other's little fingers.