The story opens with a description of the trap set by Yuma and his team to get Professor Marble's lost monster. Yuma is unable to catch the monster because it is too rare to do so. He uses a hula hoop as a trap to get the monster, but the monster is too powerful for him to catch. He then uses a trigger to take all the monsters in Yuma's collection. He tells Yuma that Professor Marble is planning to blow up the landing, but Yuma reminds him that they are not chasing down Professor Marble. They are not the ones being chased down, they are the ones holding the time bomb. The three of them put on a grand show, removing all ability effects from the target and making it impossible for anyone to approach the monster. The monster is a wooden horse with tricky moves that make any one approach it at their peril. The only thing Yuma can think to do is to hatch the monster and use it as a backup plan.