Takaki runs a small cardboard processing company. One day, he killed himself. He did this because of Yoshiyuki. Yoshiyuki is the CEO of a company that works with Takaki's company. Due to Yoshiyuki, Takaki's company went bankrupt because of heavy debts. This caused Takaki to jump off of a rooftop building. Despite the appeals from Takaki's family, Yoshiyuki was unpunished by the law. Takaki 's son Kazuma and Takaki 's nephew Mitsuru decide to take revenge on Yoshiyuki.