While the members of Group 1 set out for summer camp together, Reiko is easily forgotten. Satoru starts telling scary stories about Balloon Dogs, a creature capable of causing itself to explode; the other children doubt its existence, rationalizing that none would exist if they all blew up. The children recall the legend of a strange creature known as the "False Minoshiro" which brings death to all in its path. Eager to learn more about it, they manage to locate and capture the Minoshiro, which much to their surprise, starts communicating with them.