The genesis of the Sato bloodline's miracle was never a random mutation, but a legacy forged in desperate love and catastrophic loss. Decades ago, the patriarch of the family—Naea's grandfather—was a brilliant, reclusive scientist who redirected his entire life's research toward a singular, desperate mission: saving his beloved wife, Naea's grandmother, from the agonizing clutches of terminal cancer. After countless grueling, clandestine experiments, he achieved the impossible, synthesizing a groundbreaking vaccine engineered to aggressively target, demolish, and completely eradicate malignant cancer cells from the human body. To test the viability of this newly engineered genetic cure, he performed the critical experiment on his fifteen-year-old elder son, Mr. Sato, successfully altering the boy's cellular makeup so his blood could generate the required passive immunity and serve as the ultimate antidote. Yet, destiny dealt a cruel, heartbreaking blow; before the finalized treatment could be administered to his wife, she took her very last breath and departed from the world, leaving the grandfather completely shattered, isolated, and drowned in a silent agony that eventually claimed his own life through a fatal heart attack. The miracle cancer cure, however, did not die with them; it was permanently woven into the DNA of Mr. Sato as a dominant, hereditary genetic trait capable of being passed down to his offspring. During his wife's pregnancies, as their children were developing in the womb, this unique biological factor subtly interacted with her maternal biology, effectively turning the entire immediate Sato family into a walking, living treatment against the world's deadliest disease.
Mr. Sato grew up carrying the immense, terrifying weight of this secret, fully aware that the ruthless medical world would hunt his family if the truth ever surfaced. To protect them, he swore himself to absolute silence, never breathing a word of their unique availability to his wife or children, instead constantly guarding them with an overprotective shadow and strictly commanding them to be exceptionally careful to avoid any physical injury—knowing with absolute certainty that a single drop of their spilled, miraculous blood could alert the predators waiting in the dark. For years, this iron-clad protection held perfectly, until a single moment of absolute serendipity shattered their safety forever during a routine clinical visit. Dr. Tanaka, an exhausted physician who had spent years facing endless failures while desperately hunting for a cure to save his own cancer-stricken son, was handling a routine blood sample from Mr. Sato when an accidental slip of his hand caused a single drop of Sato's blood to spill onto a glass palette containing a live cancer cell culture. Looking through his microscope in absolute shock, Dr. Tanaka watched the aggressively multiplying cancer cells—which normally lose their property of contact inhibition and divide out of control—instantly shrink and completely vanish upon contact with the sample .
The secret layout of the science behind the Sato bloodline revealed three supernatural miracle factors of cell-mediated immunity . First, while normal cancer cells can mask themselves from T-lymphocytes, B-lymphocytes, and the rest of the immune system, the Sato blood possesses hyper-active Natural Killer (NK) cells equipped with a unique surface receptor—a biological "biometric key" that instantly detects the deception and destroys the cancer cells . Second, their DNA undergoes a specialized protein synthesis that acts as a "telomere protection" mechanism to reprogram cells; when introduced to a patient, it effectively switches off the unlimited, immortal growth characteristic of cancer . Third, the blood contains a completely unique, rare antibody known as the "S-Factor," which creates a lava-like coating around malignant cells, completely halting their ability to spread and freezing metastasis in its tracks . Trembling at the sight of this genetic goldmine, Dr. Tanaka realized this blood represented the most advanced form of immunotherapy known to science . Blinded by a desperate desire to secure infinite institutional resources and funding to save his own son, the doctor unknowingly signed the Sato family's death warrant by reporting his findings to the Agency as agency doctor staff .
This Agency operates as a massive international working space under the supreme authority and handling of the United States, cementing its status as one of the ultimate top-tier global secret organizations. The moment the main headquarters in the US intercepted the intelligence from the local Japanese branch regarding the Sato blood cure, they bypassed all protocols and delivered a brutal, direct ultimatum to the local authorities: if they attempted to protect or save the Sato family, the United States would completely destroy Japan, but if the miracle blood was delivered to them, Japan would be allowed to remain in absolute peace. Trapped under the weight of this terrifying geopolitical leverage, the Japanese agency was left with no choice but to comply with the extraction orders. At this point in the timeline, the global machine has only successfully harvested the blood of Mr. Sato, leaving five remaining members of the family still heavily targeted. Upon discovering the horrific plot, Akira had desperately fought back, trying everything in her power to stop the Agency from proceeding, fiercely demanding absolute protection not just for Naea, but for the entire Sato family. She had deeply calculated a plan to smuggle the family away to a distant, safe haven far from Tokyo's reach, but the Japan agency under US-controlled headquarters violently crushed her defiance with a chilling warning—stating that if she continued to fight for Naea's safety, they would execute her on the spot and harvest her own blood alongside them. Paralyzed by this absolute coercion and having no other options left, a heartbroken Akira was forced against her will to submit and remain a functional cog within the very agency hunting her lover.
The Agency calculated that a living Sato member could only ever provide a limited, legally regulated supply of blood; however, eliminating them entirely yields absolute profit . By launching a post-mortem harvest, secret forces can extract all five liters of blood immediately for cryogenic preservation, while violently harvesting the bone marrow and major organs to strip the entire haematopoiesis engine and deserialize their DNA without consent. This greed directly triggered the storm-drenched execution of Mr. Sato, whose body was surgically emptied of its miracle traits and flawlessly stitched back together into a hollow shell just to deceive the police, media, and his weeping family into believing it was random street violence. It builds to an explosive, terrifying countdown , because this exact same miracle blood is pulsing through his daughter, Naea, and the Agency is actively hunting her in the shadows to subject her to the exact same post-mortem harvest, completely ignoring the protection Akira bargained for . This grand revelation seals the ultimate moral dilemma of the upcoming climax: a global cure that could save millions of terminal patients vs. the unadulterated corporate evil of hunting an innocent girl, setting the stage for a monumental explosion in the plot as Akira—Agent CY—is bound to reach her breaking point, transforming her entire world-view as she evolves from an un-willing, forced protector into an absolute, dangerous rebel willing to burn the entire international syndicate down to save the singular, true love of her life.
Two years back ...
The Agency operates a massive international working space under the supreme authority and handling of the United States, cementing its status as one of the ultimate top-tier global secret organizations. The turning point arrives on an ordinary day when Akira visits the facility; as she is on her way back out, the spoken name "Sato" suddenly echoes in her earpiece, catching her off guard and halting her footsteps dead in their tracks. Driven by instinct, she shadows the sound toward a secure briefing room, where she overhears Head Nagami instructing Agent Halvard that the Sato family's blood must be supplied immediately, and to achieve this, the family must be eliminated. Unable to stay silent, Akira steps forward, her voice cutting through the clinical air like ice as she demands to know since when the Agency began murdering innocent people. Head Nagami faces her, revealing the existence of the miracle blood cure but framing it with a dark, bitter curse. Confused, Akira demands an explanation, and as Nagami lays out the raw biological reality of the Sato genetic goldmine, a wave of profound shock washes over her, though her lethal training keeps her expression entirely unreadable. She sharply demands that Nagami close the mission immediately because she will not allow it to happen, but the Head firmly counters that they have no choice—the United States is entirely serious about this project, and if the global organization does not receive the blood to launch this massive commercial cure, the US will completely destroy Japan. When Akira fiercely insists that they can negotiate directly with the US, Nagami laughs bitterly, explaining that the high-level handlers have already calculated a strict two-year timeline. A perplexed Akira questions the delay, only for Nagami to reveal the twisted corporate mercy behind it: the family was granted two years to live out their lives normally before the global market launch, rendering Akira's planned intervention utterly useless. Disgusted by the corporate coldness, Akira snaps at the absolute nonsense of it all, but Nagami completely ignores her anger, turning his attention to Hiroto—Agent Halvard—to confirm his parameters, instructing him to erase the Sato family seamlessly, disguise the operations as standard casual murders or natural deaths, and ensure the public never suspects a corporate biological harvest . Sensing a desperate leverage point, Akira demands to know if a girl named Naea is part of this family, and when Nagami confirms she is the second daughter, Akira instantly seizes the directive, demanding the mission be handed over to her so she can execute it exactly as the syndicate requires, but on one absolute condition: Naea Sato must remain entirely untouched and removed from the target list, bargaining that the remaining five family members provide more than enough biological material for the project. Her voice drops to a lethal whisper, her eyes hardening into steel as she delivers a chilling ultimatum—if the Agency violates this terms and harms Naea, she will personally ensure the entire organization is annihilated from the face of the earth. Knowing the terrifying weight of Akira's absolute dedication and lethal capability, Head Nagami gives his word that Naea will remain completely safe, provided the harvest of the remaining targets is delivered without failure. As Akira turns and exits the room with cold precision, Hiroto watches her departure in bitter silence, a singular, calculating thought running through his mind: Akira... what did you really gain by taking my mission?
Execution.....
The blueprint of Akira's infiltration reveals that her arrival in Japan under the "Crimson Canvas" prosecution mission was a meticulously calculated maneuver, designed from the very beginning to draw her into Naea's immediate orbit. She intentionally orchestrated their initial meeting and knowingly leased an apartment directly adjacent to Naea's unit in the exact same building, embedding herself into her daily life to weave an unbreakable bond of proximity and presence. Her primary tactical objective was clear: to capture Naea's heart, or at the very least, cultivate an absolute level of psychological trust that would allow her to smoothly guide Naea out of Japan, away from local surveillance, where the actual framework of the extraction mission could be cleanly executed. However, the emotional reality of the infiltration had already spun out of control, as Akira had fallen deeply in love with Naea long before the operation even commenced—a profound, suffocating affection that only magnified with every single second they spent living side-by-side. This intense emotional investment made the ultimate betrayal devastatingly painful; when Naea completely rejected Akira's feelings to marry Kenji, the wedding shattered Akira entirely, breaking whatever internal restraint she had left. Pushed over the edge by an agonizing mix of heartbreak and operational duty, a broken Akira finally moved to violently execute her primary directive—pulling the trigger herself to fire the fatal initial shot that ended Mr. Sato's life on that storm-drenched Tokyo street, initiating the horrific harvest.
Against all odds, Akira unexpectedly succeeded in carving out a definitive place for herself inside Naea's heart, but this hard-won emotional victory only heightened the horror of her reality, as she was still bound by her absolute directive to systematically eliminate Naea's family and deliver their harvested blood to the global syndicate. Trapped between her lethal duty and her suffocating affection, Akira committed a massive, catastrophic blunder that fundamentally endangered her entire infiltration strategy. By spending a deeply intimate night with Mrs. Takahashi, she crossed a line of ultimate betrayal—shattering the very emotional foundation she had built and devastatingly cheating on the profound trust Naea had blindly placed in her.