"Grimory", the legendary and terrifying book of witchcraft, suddenly reappears with the advent of leap July... On a night with an eerie atmosphere, the hot goddess detective Catria was ordered to find the whereabouts of the nightwalker Fire Wolf. She had no idea that she had been targeted by the devil. At the critical moment, the fire wolf Iguda came to the rescue. From Catria's mouth, Fire Wolf learned that the long-lost "Grimory" had reappeared and had fallen into the hands of the evil ghost Lester, who was hiding in the Black Arms Middle School, waiting for an opportunity...