When our eldest daughter started kindergarten, my wife started working part-time at a factory in the city. Until then, she had been a housewife raising the children, so she seemed very lively, and as her husband, I was watching her with a smile, thinking that it was good for her as it helped the household finances. However, recently, it seemed that my wife had been having tea and chatting with a student who was working part-time at her place at our house... I wasn't really interested, but I decided to set up a camera in our house...