The school festival, which all students look forward to, has arrived once a year. The laid-back, carefree Reina-chan was in charge of ordering costumes for the entire grade, but for some reason, she received a reverse bunny costume that was too obscene. When she tried it on, Reina-chan's breasts and vagina were completely exposed! All the costumes that arrived for the other classes were also erotic, so she ended up helping out at the other stalls... Will this year's school festival end safely?
