Since my daughter started kindergarten this spring, my wife has started working part-time at a precision machinery factory in the city... Until then, she had been a full-time homemaker, so it's a financial relief for the household, and I, as her husband, thought it was a good thing and watched over her with a smile. However, recently, my wife has been bringing home a part-timer in his twenties who claims to be a colleague from her part-time job, and they seem to be chatting and laughing together after work.