Suzie, an American woman residing in Japan, experiences a drastic upheaval when her husband and son mysteriously vanish in a plane crash. As a form of solace, her husband's technology company presents her with Sunny, a state-of-the-art home robot. Initially, Suzie resists Sunny's efforts to alleviate her emptiness, but over time, a bond forms between them, leading them closer to unraveling the true events surrounding the disappearance of Suzie's family.