S country, there are legends about abilities here. Some remote places think they are just legends, but abilities exist. It is said that if a child is born between two people with innate abilities, there is a 50% chance that they will be ability carriers. But what they don't know is that they can also have abilities through acquired efforts and their own conditions. This country may be maintained by the four major forces. They are the balance here, and the story begins with them.