Witnessing the brutal murder of his parents by a rival gang as a child, Kasama Ryuuji harbors a deep-seated hatred for the Yazuka. When he later discovers his guardian figure, the woman who raised him, brutally assaulted by the same group, his resolve hardens. Unexpectedly, a man named Araki enters his life claiming to be his long-lost brother and offers a glimmer of hope and warmth. As Ryuuji forms a strong connection with Araki, he soon learns the shocking truth – Araki is the sole survivor of the Kasama gang, dedicated to safeguarding Ryuuji at all costs. Now, faced with conflicting emotions and loyalties, Ryuuji must grapple with the revelation that the one he trusts the most is intricately tied to his turbulent past. Can Araki, known as the dragon, shield Ryuuji from the dangers lurking in the shadows, or will their bond be tested as adversaries seek to exploit Ryuuji for their own gain?