Sera's older brother owns an antique shop. When he brought home a "clockwork doll," it was Sera's kiss that woke the doll, Satsuki, from his long slumber. Satsuki and his constant smiles leave Sera perplexed but ever more charmed. But, when Satsuki does cry, screws fall out along with his tears, and Sera learns that when the last screw falls Satsuki will become a real doll, never to awaken again...