Boseiai no onna: Hiruma kara shitai!.

A wife of a couple who are not blessed with children is devoted to her volunteer work out of an abundance of maternal love. One day she starts to take an interest in a young man who came to do electrical work, and she develops a maternal love for him. The young man had also lost her mother at an early age and develops a liking for her too. She learns of his upbringing, when as a young man he had a desire to study but was unable to get higher education due to his family background. She starts teaching him English conversation, and the two grow closer and closer until they finally cross the line. Meanwhile, her husband is having an affair with a young woman. Eventually the couple return to a normal life, but the young man will turn to some extreme measures to show her his love