Married Female Teacher: A Mature After-School Life (1999)

High school teacher Yoko Fujita harbored a hidden desire to be a slave. However, her beloved husband, Toshihiko, was a true masochist. Every night, Toshihiko's sexual desires were satisfied with verbal abuse and spanking, but Yoko lived each day feeling frustrated. Then, one day, Toshihiko is caught stealing underwear. From then on, the balance between the couple rapidly crumbles. Around the same time, Keiji and Ichiko, a high school couple who are both masochists, continue their strange romantic relationship. What will become of these four masochists...?