The film features Comet Robo, a home for robots who can make anything, and Roboly, a robot girl who is the best at what she does. She learns that there is one "important thing" that she cannot make on her own, so she and her robot bird partner Koto leave Comet Robo to find it. They find a music box and arrive at Anpanman's world to find the owner. While spending time with Anpanman, Roboly's chest begins to feel "warm." During this time, Baikinman creates the strongest mecha "Roboking" and plans to turn Comet Robo into Comet Baikin-Robo. Thus, Anpanman and friends try to protect Comet Robo while Roboly searches for the "important thing."
[Source: Anime News Network]