Kodai Okuhira, a successful Manager Director, finds himself entangled with his attractive new secretary, Yukino Miyachi, who is more than meets the eye. Despite her role as a secretary, Yukino harbors a dark secret - she's actually a skilled assassin tasked with eliminating Kodai. Their worlds collide when Yukino, on a mission to gather intel on Kodai, succumbs to his charm and they share a passionate night together, leading to unexpected consequences. As Yukino grapples with the aftermath of their indiscretion, her life takes a drastic turn. Follow the unconventional romance between a well-known strategist and a novice heroine leading a dangerous double life. Can she navigate the complexities of her relationship with her promiscuous husband while plotting his demise?