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Kurogami Financial Group: Finances the operations of various renowned private high schools in Japan. It has gained considerable influences thanks to its well-known graduates from economic sectors, law firms, etc...
Ouma: Demons that lives between the gap of time and space. They are unaffected by this dimension and their existence is a threat to humans who live within the flow of time...
Ability User: Refer to humans with special abilities that are capable of combating Ouma. Most people pass these powers to their descendants. Sound Users and Card Wielders are within this category.
God Descend (Equip): A unique ability of Card Wielders. The ability user gains the power to combat Ouma by letting a god possess the user who formed a pact with it. Personality and physical change can occur during God Descend. Neon cannot control her body in battle, so Sigma have to use music to guide her actions in battle.
Setting: The setting is in Tokyo, Japan. based on the Showa era of the Japanese culture of the 50's and 60's.
Setting Genre: The artistic design is based on the Showa era of the Japanese culture of the 50's and 60's.
Technology: Modern world with a twist of Victorian Steampunk aesthetic.
Mysterious Blue-Clothed Person: An unknown entity who might have a hand in changing the peaceful world that Sigma lives in.