Gushing Prayer: A 15-Year-Old Prostitute (1971)

4 High school students, two girls, Yasuko, and Yoko and two boys, Koichi and Bill experiment with group sex to discover the reason for their dissatisfaction and desensitization. They want to know how to 'beat' sex and thus destroy adult society. When 15-year-old Yasuko, who has become pregnant by Koichi, tells her classmates that she slept with their teacher, she is charged with treason and breaking their vow not to have sex just for pleasure. She explains that she only felt something because she prostituted herself. To find out if this is so, and encouraged by her friends, she becomes a prostitute and takes a journey to discover herself. When she locks herself in a hotel room and decides to commit suicide, her teacher and Koichi suddenly appear.