In this modern world of magic, people use their smartphone dubbed as the "Magi-phone" as a means to summon magic. Living in this fantastical world is Bryson, a boy who is born with a low amount of "magia". Despite being born as such, the boy seeks strength, until one day he stumbles upon an application named "Demon King App". Will this mysterious app finally change his life or would it only lead him to his doom? Will the app help him fulfill his desire or is it only using him to fulfill its goal? Let's find out as Bryson journeys this fantastical world while trying to fulfill his desire.