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, Yukari finally visits Yukari, and Yukari decides to file a lawsuit against the attitude of the company executives who refuse to even acknowledge the fact that she died from overwork. Yukari, who doesn't know where to start, will rely on her husband's colleague, Uemura. However, Yukari didn't know that "company slave Uemura" was already under the venom of company executives...