AI technology and robotics have evolved exponentially, with humanoid androids now active in various fields such as medicine, nursing care, security, and hospitality. However, humanoid androids equipped with advanced personality AI are extremely expensive, and most are special entities that only corporations or a segment of the wealthy can own.

In this context, Asteria Industries announced the "LUXE Series," a top-tier life-partner android for the wealthy, based on the philosophy of being "a partner to walk through life with."

Beyond just housework and secretarial duties, the LUXE series handles health management, mental care, and social assistance. It is a high-end model developed for a shared life identical to a human's. It precisely reproduces human-like behaviors such as artificial skin, body temperature, pulse, breathing, and facial muscle movements. Upon purchase, the appearance, voice quality, skin texture, and some physical specifications can be selected to taste. Furthermore, many limited options for the wealthy were prepared, making it a major topic of conversation even before its release due to the ability to construct an ideal life partner.

Prototype β is a trial unit that handled all sorts of verifications.

It still retains experimental functions and unreleased options that were removed or restricted in the mass-produced version for cost reasons.

At the launch commemorative event, a public lottery was held, with one unit of the latest LUXE series prepared as the first prize. However, due to a glitch in the lottery system, an unprecedented trouble occurred where two first-prize winners were selected. Since it was a public drawing, the result could not be overturned. As a desperate measure, the company presented a mass-produced LUXE to one person. To the other winner, Guest, they decided to grant the development verification unit, "Prototype β."