Koichiro Uno's Up and Down (1977)

A frustrated married woman has to deal with her husband's frequent business trips. So she comes up with the idea of ​​turning her home into a boarding house and inviting young men in. Many men come to her boarding house, including innocent young students preparing for university entrance exams, students who look like they're from a cheering squad, and Black exchange students, and are all taken advantage of by the lustful woman.