When extraterrestrial civilizations were encountered, it was revealed that humans were the only ones to have created various sports. This resulted in a huge increase in the number of alien sports fans, with the most enthusiastic constantly seeking opportunities to participate in matches or witness impressive performances. Eventually, it was decided that any disruptions to the cultural norms of other planets would be considered illegal. To enforce this, a group called Rabbit Force, made up of girls who transform into rabbits, was established to maintain the peace and apprehend any offenders.
