Kodai Okuhira, is the director of a large corporation. Yukino Miyachi, his excellent and beautiful new secretary, is an assassin who had a mission to kill Kodai. The night that she was going to carry out her mission, she makes the mistake that changes her destiny significantly. It is very difficult to fulfill her job as an assassin, a newly married life and a husband with a great sexual appetite!

Fujiko Yomogida is an office worker with an academic complex. She works hard and becomes a full-time employee at an insurance company, but because of her diligence, she is unable to refuse the work she is asked to do and accepts it with a smile on her face. One day, an elite company employee, Soma Nishina, moves into the room next door. Fujiko is soothed by the time she spends with her very kind and gentlemanly neighbor. But why did Nishina, a supposedly elite man, move into this shabby apartment, and why is he so kind to Fujiko...? It seems that Nishina, who does not speak much, is a stranger to Fujiko...?