From the first train to the last train ... Yukari, a wife who lost her husband who was forced to work at the company without even being given a break due to overwork. A month after that day, she finally visits Yukari, and Yukari decides to file a lawsuit against the company executives who refuse to acknowledge her death from overwork. Yukari doesn't know what to do with her, so she has to rely on her husband's colleague, Uemura. However, Yukari didn't know that "company slave, Uemura" had already been poisoned by the company's executives.
