In a futuristic world where people can freely change their appearance, Keito is a typical representative of his generation. He shows a tendency towards superficial connections in virtual spaces. One day, his life is disrupted by Ayana — a new student with a natural, unaltered appearance, who awakens unfamiliar, thrilling feelings in Keito.
Keito gradually realises that Ayana is actually an experimental model of an anthropomorphic robot, whose consciousness resides in a world created by a supercomputer. A deep emotional bond forms between them, but for their romantic relationship to develop, they must accept the terms of a user agreement.
These arrangements involve transferring Keito's human body to Ayana's creator in exchange for eternal life with his beloved in the virtual world. Their fantastical love story unfolds against the backdrop of incredible scientific and technological progress, forcing the characters to make a difficult moral choice between love and hidden desires.