The story takes place in the vast interstellar universe. This is a fantasy world with card abilities as its core strength. Planets are connected to each other and communicate and trade through interstellar channels. There are huge differences in the level of culture and technology between planets. Some planets are extremely technologically advanced and can produce cards with advanced mechanical devices; while other planets retain ancient card-making traditions and inherit mysterious ancient card-making techniques. In the interstellar society, card maker is a highly respected profession, and the level of card maker directly determines a person's social status and wealth.
