Miss Machiko (1981)

An adaptation of the sex-comedy manga series "The Shame of Miss Machiko" (1980-1982) by Takeshi Ebihara. The middle-school teacher Mai Machiko is young, attractive, and very popular among her students. A number of her voyeuristic male students conspire to catch her in various stages of undress. They repeatedly lift up her skirts, stare at her underwear, and spy on her while she is bathing. Mai is kind and patient, never getting angry with their pranks.