The Amamiya Brothers, Masaki and Hiroto, embark on a perilous quest to uncover the truth about their missing older brother Takeru, who vanished one year ago. With their lives forever changed after losing their parents at a young age, the two brothers must navigate a treacherous world of gangsters, corruption, and murder to find their sibling. As they delve deeper into the mystery, the secrets hidden in their past begin to unravel, threatening to destroy the very bond that holds them together.