the housewife's desire for valor, being held in a tattoo

Mikako works at a small liquor store run by herself. Because his husband Toshiyuki was seriously injured, he hired one young man, Nakajima, as a part-timer and made him stay at home. Mikako didn't like Nakajima very much. One day, Toshiyuki's colleague Akita and Nakajima go to the firefighter. Then Akita saw a tattoo drawn on the back of Nakajima. The next day, Akita tells Mikako about tattooing. Mikako became interested in Nakajima, and gradually attracted him with mysterious and shaded backgrounds. In the midst of this incident, Akita was stabbed and his wife Hako and Toshiyuki had an affair with him. What is the action of Mikako?