The Royal Butler Corps

The forbidden spirit-summoning grimoire, The Song of Invocation, which the Black Moon Order had kept sealed away since the Middle Ages, has been stolen. Mysterious black magic and more than a hundred combat summoning arts have entered the modern world, plunging a once peaceful continent into turmoil. Giant aberrant creatures, developed by humanity to resist unknown summoned beings, have run amok because the technology is still immature. More and more “monsters” are appearing in the seas, forests, and wilderness. As military weapons prove increasingly unable to counter the activity and destructive power of these mutated creatures, people begin trying to use the Black Moon Order's summoning arts to fight the giant monsters. Over time, a true demon-hunting legion has risen to the forefront of the fight against aberrant creatures: the Royal Stewards, a global mercenary organization of pact-makers backed by the Sansed royal family and founded by Archibald, former Second Bishop of the Black Moon Island Order.