An ordinary night between friends becomes something far more dangerous when one of them reveals an impossible truth: he possesses a device that allows travel to adjacent universes. The device was not invented or stolen-it was given to him by another version of himself. According to that explanation, reality is fragmented across multiple neighboring multiverses, each holding a fraction of the matter missing from their own. Together, they form a complete but divided whole, governed by different rules, constants, and outcomes.

The claim sounds convenient, even absurd, until evidence begins to surface. The device doesn't just allow travel; it allows observation. From another universe, the man witnesses events unfolding back home that shouldn't be happening-an armed stranger searching his house with clear intent. The threat is real, deliberate, and already in motion.

There are limits. Travel requires absolute physical commitment. Anyone entering must be fully contained within the device's field. Partial contact isn't survivable. There are no test runs and no safe demonstrations.

With danger closing in and no certainty about which universe offers safety, a choice must be made quickly. Leaving means abandoning the only life they've ever known. Staying may be worse. What begins as disbelief turns into a decision that will permanently alter how reality itself is understood.