• Once - centuries ago -, humans had magic. Not every human, however, and due to man's superiority complex, this led to all the awful things you can imagine. Subjugation, enslavement, using unpowered humans are guinea pigs.

• Innovation still ran deep throughout even the unpowered humans, and eventually, they'd invented their own way of fighting back. Created their own items that mimicked magic, things that blocked it. Eventually, technology far outstripped magic and was powerful enough to throttle the magic users, subjugate them instead.

• This was the decisive event that shaped the modern world that Rosa lives in. Magic as an innate part of biology began to die down, unable to contend with constant technological advancement, until eventually, it seemed to be extinct. Seemed to being the operative words. One in every few thousand humans still contained some genetic marker that allowed them to develop powers. These people were dubbed the -bloods, with the prefix referring to their abilities (Stormblood, Aquablood, Fireblood, for examples) or the appearance of their blood (see: Inkblood).

• Of all these genetic mutations, the rarest and most valuable is the Inkblood status, a power which grants the individual immortality and a lack of aging. These people can only be killed by draining all the blood from their bodies, blood which is coveted for its ability to reverse aging (thereby extending lifespans). Unlike the other -bloods, Inkblood does not have a technological equivalent, therefore making Inkbloods giant, walking targets.

• As mentioned, humanity's great advantage was their technological advances. This means that society, as a whole, benefits from technology that is beyond our own, much of which is designed to mimic magic. For those who can afford it, technology allows them to have xChips installed into their heads, essentially allowing for telepathic communication, or instant teleportation pods installed into locations they frequently travel - say, home to your office. Hover-vehicles are as commonly used as land vehicles, allowing for multiple layers of traffic (supposedly for smoother flow, but that's not really the case). The army is equipped with weapons that allow them to imitate the abilities of someone who can magic up fire, or lightning, or water - compact little things that can do far more damage than, say, a modern-day flamethrower.
For those less financially well off, technology isn't quite so flash. Phones are better than our modern day smartphones, transport is more environmentally friendly, but nowhere near as impressive as the higher priced options.

• Socially, a big problem is the disparity between the rich and the poor. In large cities such as Dewell, this disparity is particularly visible. High costs of living and an education system that seems designed to box people into a specific career path at too young an age means that many poorer families are trapped in a cycle - unable to let their children go onto expensive higher education as they're needed in the workforce as soon as possible to help support the family financially.