Gokan Five leader Akai Hajime is holding an audition for someone to replace Gokan Peach and to work part-time at the bar and airsoft shooting range EA. But only three candidates show up and two bail out once they learn it's not just an interview for a regular part-time job. The only one remaining is Momoka, a 17-year old high-school girl, who also just wants a part-time job but gets convinced by Akai to at least try the airsoft shooting range.