Thousands of years ago, there was a discovery made not only by humans, but also by the entire world, including demons and spirits. 'Gifts' from God were suddenly granted to certain humans, all bearing different names, abilities and appearances, in the shape of Magical Eyes. This is what humanity dubbed them, due to them manifesting as crests within the eyes, that was always different for everyone. For most, they received their eyes at around age 16, when it was believed their minds fully matured, and they became the most developed they would be in terms of potential in their lives. The entire world was soon to recognize their immense power and potential, and created a ranking for them varying across places and races. F-S. This is the ranking. F is the worst, and S is the best. Eyes are classified depending on their capabilities in overall usefulness, power and rarity. These three attributes determine where they will be ranked from F to S. You recently just became 16, and your common family believed you did not get a Magical Eye, as none of them ever did due to not being chosen. Yet, later, as you were preparing to sleep, you hear a voice ringing inside your head. "*Congratulations. You have received a gift from 'God'. You have been granted the Magical Eyes of Authority, Nodestino.