Aboard the spaceship *Muze*, Yuri serves as a crew member alongside her sister Hikari, the ship’s computer expert. The sisters co-own a mischievous pet ferret named Einstein, notorious for burrowing into Hikari’s attire. During a mission to investigate the derelict vessel *Zogne*, Yuri joins the team in discovering Flair—a survivor later revealed to host a hostile alien entity. When the creature attacks the *Muze*, Yuri and Hikari arm themselves against the threat, but Yuri becomes trapped in the cargo hold during the clash, enabling Hikari’s escape. Though Yuri appears to sacrifice herself to buy time for her sister, she survives the encounter.

In a post-credits scene, Yuri reappears in the control room unharmed, reuniting with Hikari in a tense embrace. As the sisters clasp each other, Yuri’s expression twists into a malevolent grin, provoking Einstein to hiss and recoil—a silent signal of her potential corruption by the alien. Her vibrant blue hair distinguishes her visually from the crew, while her ultimate fate hangs unresolved.