At the invitation of the company's boss, Shingo Imamiya, his wife, Setsuna, warmly welcomes his subordinate, Kikunaka, to dinner. The next morning, Kikunaka was asked by Shingo to do something. It seems that his wife is cheating on him, so he asks him to investigate. Kikunaka follows Setsuna, thinking to himself, "The wife of the boss I look up to would never do such a thing...". Shingo's guess was right. I witnessed a man and Setsuna entering the hotel in the middle of the day...