A widow surrounded by middle-aged men

Yukari, a wife who lost her husband to death from overwork while working for the company without even a day off...from the first train to the last train. One month after that day, Yukari finally visits Yukari, and the company executives refuse to even acknowledge the fact of death from overwork, so Yukari decides to file a lawsuit. Yukari doesn't know where to start, so she turns to her husband's colleague, Uemura... However, Yukari did not know that the poisonous fangs of the company executives were already falling on "Corporate Slave Uemura"...