Very Private Lesson 3

Third film in the "Kyokasyo ni nai" series based on manga artist Okada Kazuto's original story. Otome Girl's High School teacher Tairaku Arihiko lives with his pupil Aya. One day an older classmate takes an interest in the adorably popular Aya and kidnaps her. Aya is the daughter of a yakuza boss, and her kidnapping puts Arihiko's own life is on the line. He rushes to her rescue, but the situation takes a turn for the worse. On the other hand, in the school there was an incident in which May Yayoi took the students hostage…
(Source: JFDB & TMDb)