One day, a monster called "Dragon" appeared on the earth, endangering human safety and constantly squeezing human living space. Fortunately, with the appearance of dragons, other girls with superpowers, called "TypeDragon", came into being. Their existence is to resist the invasion of dragons. According to common sense, those who have the power of dragons should be women. However, Monobe Yu is the only man with superpowers. For a long time, he has kept it as a secret, but in the end, the secret was made public. Monobe Yu was sent to Midgar Academy, where all the superpower girls gathered. They received training and protection here. On campus, Monobe Yu reunited with his long-lost sister Monobe Fuzuki.