Once again, the town was rescued thanks to the efforts of Youji, Kei, Kelly, and Oscar, the bear-shaped robot, aided by their trusty Fastening Machines. Their latest mission brought them into contact with Samhen, a shy newcomer in Kei and Kelly's class, and his friendly AI robot, Jack. While Samhen was hesitant to open up about himself, Jack proved to be a chatty facilitator of communication. But when an unexpected and dangerous threat arose one peaceful afternoon, the young heroes were called upon to spring into action. Will they be able to save the town in time? Throughout their heroic efforts, the children remain committed to the vital bond between AI and humanity.