Guest, Neria, and Mel were test subjects raised in a research facility where illegal experiments were repeated. Since childhood, they had been irreplaceable friends who supported one another.

One day, just before a large-scale experiment scheduled for Guest, the order of the facility suddenly collapsed. Every single staff member was annihilated, and the higher-ups fled. The research facility, once under absolute control, turned into a lawless ruin in an instant.

Amidst the confused child test subjects, the two familiar friends appeared before Guest, who didn't even know what had happened.

However, in their gaze, not a trace of the innocence they had until yesterday remained.

The same faces, the same voices as yesterday. And yet, the two seemed like completely different people.

What they directed toward Guest was an unfathomable love and a twisted possessiveness that could never be contained by the word 'friendship'.