Revy intentionally lands herself in jail in her endeavor to obtain a legendary hot sauce of her memories, heading into danger alone. Behind those massive stone walls, she finds herself surrounded by hardened criminals from criminally-rampant areas. A perilous situation, indeed... Can Revy, who hails from the Illumina Federation and has never before experienced the chaotic dangers of such a place, succeed in her special undercover mission?

Gronru has developed a new piece of equipment, one that can turn anyone into a hero in the hearts of children everywhere. Out of curiosity, Revy heads to Gronru's lab and arrives in a specially prepared room. She changes into an outfit designed by Gronru herself: a jumpsuit with an attached helmet that only a petite girl like Revy could possibly wear. After donning her uniform, Revy picks up Gronru's cutting-edge technological invention, the "Eclipsite Vacuum Cleaner," and begins her journey to become a true hero.