Zettai Kekkon Suru Man vs Zettai Kekkon Shinai Woman

Please marry me." Tetsuko was suddenly proposed to by Kosuke, the vice president of a business partner who she had just met (but had made a mistake overnight). "Eh, it's impossible" When Tetsuko, who has no desire to marry, immediately refuses him. However, in no time, one after another Kosuke wins the hearts of the staff at the workplace. Tetsuko starts to feel like "there is no option not to get married". Why did this happen? What are Kosuke's true intentions? A romantic battle about marriage between a stubborn man and a stubborn woman!