This year, when our daughter started kindergarten, my wife started working part-time at a manufacturing factory in the city. Until then, she had been a housewife raising children, but now she was working energetically, so I, her husband, was glad that she was doing it and helped out financially. However, recently, it seemed that she had been having tea and chatting with a student who was working part-time at her place at our house... I suddenly felt uneasy, so I set up a camera in our house...