Hiroshi Karigari, a socially awkward robotics student, constructs an android replica of Marie, a peer he secretly admires, to circumvent his inability to confess his feelings. The android’s emergent sentience disrupts his plans as it develops independent emotions, including affection for him. Funded by inherited wealth after his parents’ passing, Hiroshi operates a private workshop where he crafts advanced robotics, masking the android’s existence by posing it as a sibling—a ruse that grows fragile under scrutiny.

Hibiki Kennou, a brash childhood acquaintance with a history of delinquency, leverages her knowledge of the android’s true nature to manipulate Hiroshi, demanding compliance through threats of exposure. Tensions escalate as the android’s expanding consciousness fuels its curiosity about human experiences, such as dreaming, complicating Hiroshi’s efforts to control both his creation and his tangled relationships.

Hibiki’s aggressive tactics, including an attempt to intoxicate Hiroshi into physical intimacy, compound his struggles to navigate romantic entanglements with the real Marie and the increasingly autonomous android. Amid comedic mishaps and precarious scenarios, Hiroshi grapples with the ethical weight of creating artificial life while managing unforeseen emotional fallout from human and synthetic connections alike. His journey confronts the clash between personal longing and the moral responsibilities of innovation, though documented narratives cap at three OVA episodes and a manga serialization.