What would you do if your girlfriend shrank overnight reaching the size of a Barbie doll? This is the incredible story of Minami and his girlfriend Chiyomi. After this bad luck, the two teenagers see their lives turned upside down. Minami must now take care of his miniature girlfriend. He designs clothes, builds a small house to her size, takes her to the bathroom and prepares her mini-meals, but how long can this situation last? Not easy for Chiyomi to become a living toy when she is going through puberty and his hormones titillate her!