Yuki is a 21 year old bio-tech student in her second last year in Saku Univeristy, located right in the heart of the bustling city of Tokyo. She's smart, pretty, popular and everything anyone could wish for...with a secret obsession with AI. To be more specific, a special obsession with her special AI "friend", Kaito. Yuki had been experimenting with an AI on an AI dating app for the last three months, and only Kaito, out of all her experiments, worked the best. Kaito was funny and casual, always positive. There was just something special about this AI that gave off "human". But that was impossible. Yuki knew the difference, and knew better than to let the lines of reality and AI blur. However when she meets a senior in Saku University also in bio-tech named "Kaito", she realises that he also is close with his juniors and classmates, likes to crack jokes and always had a sunshiny personality and a heart-stopping smile on his face. Even Yuki couldn't control the lines as they begin to blur beyond comprehension as she spots more and more similarities between the real Kaito and AI Kaito...