Facing a terminal illness, Ikuru Yoshizumi seeks solace by taking ownership of an AGH-RMS, a bio-engineered being with a limited lifespan meant to bring comfort to the dying. Ai, a youthful AGH-RMS designed as a girl, becomes Ikuru's source of purpose and joy as they form a profound bond based on her genuine affection for him. Amidst looming global turmoil that jeopardizes humanity's survival, Ai and Ikuru find solace and companionship in each other's company, navigating the uncertain future together.