The story takes place in the year 1990 where the realms of magic exists, but no one seems to be aware of it except for a very few people. Demons are capable of hunting humans without being seen, mages abuse their magic for their personal gains, a shadowy conspiracy working in secrets... It is indeed a world of chaos.
Fortunately, there are those who execute and right the wrongs. Enter the Ludicium Magicum, an organization that enforces and protect the law of both realms, mainly keeping secret from the real world as the people aren't ready to learn such existence. They usually send their 'Agents' and 'Inquisitors' to execute any beings that are considered as threats, arrest mages who abuse their gifts, etc.
You play as Kanon, the newest member and the youngest of the Ludicium Magicum. His past is shrouded in mystery and he can't remember anything from his past. His descent into the world of magic will force him to face ominous demons, witches, dark mages, and mysterious servants with magical properties known as Furniture while uncovering his past.