J.D. mysteriously collapses after the group arrives back home and is found out to be an Artifact, a Jasper-Doll. Angelique and Hyuga set out to find his cure, their only clue from a small pouch containing Sunflower seeds and J.D.'s last words of "I have to return." They go to a town called Kozu, connected to J.D.'s past. There they learn more about J.D. as well as about his first friend Kai and the reason behind J.D.'s constant smile. Kai's song seems to be the only hope they have to finding a cure. However, J.D. attempts to leave the group after recovering but learns that everyone sees him beyond being a machine doll and just for being himself, even if a doll is not supposed to have emotions thus being "defective".