Soul fears

The universe where everyone has a soulmate based off of their fear. Each person has a fear and a mark on their right wrist shows what it is

Fiction with some action and realism

The first two people who found Meinu island found there was something different there. Soon they both noticed a mark on their wrist that represented their greatest fear and they had exact opposite marks. Later they found a device that was red when they were close to each other and blue when they were far away from each other. They later found out that it meant they were soul mates and soon enough the population grew but the rest of the world still did not know about them

The same laws of Physics we have

The only magic used is the magical objects

General tech such as phones ad computers but they have very advanced tech as well such as trains that can move on ground with out a track and also fly in the air when needed