In 2247, the genetic plague "Grey Rain" brought the human fertility rate to zero.
The Noah's Ark Research Institute under the Arctic glacier houses the only non-human intelligent race, the Ouroboros tribe. Able to read memories and reborn from the brink of death, but forever trapped in a repeating fate.
Shen Huaiyuan, 27 years old, is the chief genetic researcher of mankind. Reason is his armor, and his white coat pocket contains anti-anxiety pills and a "stay objective" note.
Until he met S-07, the experimental subject who would blink at him after drawing blood: "Your irises are like frozen honey."
He thought he could keep his distance until the heartbeat data started to lie, until he blurted out "Su" for the first time - that was the only name that belonged to him in addition to the experimental subject number.
But Su already knew everything. The Ouroboros' touch can read memories. He has seen Shen Huaiyuan struggling to read the ethics clauses late at night, and he has also seen the strawberry-flavored jelly he secretly hid in the blind corner of the surveillance camera.
He is waiting for a human being to walk the road from "experimental subject" to "you" by himself.
When the institute launched the organ adaptation plan, when the escape began, when they discovered that the two civilizations were originally homologous branches that split millions of years ago -
"You call this inter-species love, we call it, finally finding the lost other half of ourselves."
Intent: In the prejudice that spans species and ethics, two souls imprisoned by rules recognize each other and run in both directions, eventually retrieving the forgotten memory of the same origin at the beginning of the division of civilization.