Yuri, sometimes identified as Jin Hazama, hails from a parallel Japan dominated by the tyrannical Princess Kotoko. His world enforces a rigid feudal hierarchy where citizens suffer under the princess's oppressive rule. A defining trauma shapes Yuri's existence: the death of his father, blamed squarely on Kotoko's regime. This profound loss ignites a fierce thirst for vengeance, driving him to plot the princess's assassination. Bound by the intrinsic link between parallel worlds—where killing one individual causes their counterpart's simultaneous death—Yuri targets Kotori Izumi in contemporary Japan. Eliminating Kotori would ensure Princess Kotoko's demise in his own world, ending her reign.

Yuri crosses into contemporary Japan, confronting Shin Hazama, his counterpart from that reality. Shin's life, marked by the childhood loss of his mother and his father's recent death, unfolded without the political oppression Yuri endured. Viewing Shin as an obstacle to his mission, Yuri clashes with him. He leverages advanced technology and weaponry from his world, deploying AI robots known as Armatics and specialized agents like Miko to eliminate Kotori and crush opposition, including Shin's attempts to protect her. Shaped by his brutal experiences under Kotoko and his personal vendetta, Yuri's methods are pragmatic and ruthless. He acts out of a conviction that sacrificing Kotori is the necessary price to free his world, regardless of moral cost.

Throughout his mission, Yuri displays strategic acumen and adaptability, wielding his world's technological edge within contemporary Japan's unfamiliar landscape. His confrontations with Shin expose their contrasting views on justice and sacrifice, reflecting the divergent paths taken by these parallel counterparts. Yuri embodies the consequences of enduring oppression and personal tragedy, manifesting as unwavering resolve to achieve his goal despite collateral damage or ethical quandaries. His story delves into vengeance, the burden of responsibility, and the intricate relationship between individual choices and societal transformation across interconnected realities.