Ryūmonji Seigō (Hitoshi Ozawa), leader of the Ryūmonji Clan and known as the 'Immortal Dragon,' occasionally leaves the yakuza world to run a coffee shop, helping troubled locals. When former cop Kakuta (Hiroyuki Watanabe) asks for help with a wire fraud case, Ryūmonji entrusts his men, including Kanbara (Yasukaze Motomiya), to deal with the criminals. However, a drug deal within the family is exposed, and Ryūmonji works to resolve it. As he investigates, more problems within the organization arise. “The Ryūmonji Clan must remain noble thieves—protecting the weak.” As his dragon tattoo comes alive, the legendary yakuza takes on modern-day evils!