In the heart of bustling New York, twelve-year-old Aiko Takahashi's life is shattered when she returns home one fateful evening to discover her parents brutally murdered. Her father's lifeless body, throat slit, and her mother's battered form leave her reeling with shock and grief. In the wake of this tragedy, Aiko is thrust into the care of her uncle Hiroto, the only family she has left.

Haunted by the gruesome circumstances surrounding her parents' deaths, Aiko finds solace and purpose in the teachings of her uncle, a skilled martial artist and former detective. Under Hiroto's guidance, Aiko channels her grief into determination, vowing to uncover the truth behind the heinous crime that robbed her of her family.

Driven by an unrelenting thirst for justice, Aiko delves into the shadows of New York's underworld, where she discovers a web of secrets and deceit. With her uncle's expertise and unwavering support, she embarks on a perilous journey of investigation, unearthing clues and confronting dangerous adversaries along the way.

Yet, in her pursuit of answers, Aiko finds herself confronted by enigmatic figures shrouded in mystery. Two females emerge from the darkness of her memories—a woman draped in white with hair as pale as snow, and another cloaked figure, donning a distinctive Chillba hat. As Aiko unravels the twisted threads of deception, she realizes that these elusive figures hold the key to unlocking the truth behind her parents' murders.

In a race against time, Aiko must navigate treacherous alliances and face her deepest fears to unravel the sinister conspiracy lurking in the shadows. With each step closer to the truth, Aiko discovers that the path to justice is fraught with peril—but she will stop at nothing to bring her parents' killers to justice and find peace amidst the chaos of her shattered world.