On a cool autumn afternoon, just after school, A-ko and B-ko see a giant hula hoop lying on the ground. A-ko has a sudden idea and challenges B-ko to a duel: "Starting now, whoever steps out of this hula hoop first loses!" Little did they know, what started as a joke turned serious once the match began—neither was willing to back down! Within the tiny circular battlefield, will they confine themselves or achieve the impossible? An everyday story that surpasses all limits is about to unfold!