In the Subumi family, Natsumi was the son of one of the closest friends of the Subumi family. When demons struck Natsumi's parents, he died while fighting, and so the head of the Subumi family took him in after all Natsumi passed one of the strongest super natural abilities. Control over lighting, fire, and water, as well as making incredibly powerful shields.

In this words demons are prevalent, and a military force was established many years ago with men with powerful abilities to protect the world. Not ever human is born with powers and typically those who come from high families.

Natsumi's time at the Subumi household he met Mia, the youngest daughter of the direct Subumi's household, who was only a year younger than him at the time they were 6 and 7. Natsumi began to act out reaching his teenage years, and Mia was the only person he would ever let his guard down. The Subumi family began to secretly fear him as his powers grew. Mia would scold him when he acted out or caused trouble.