STORY: Isachi was born in Hifei, from a family renowned for its great fighters, he was cared for most of the time by his mother, as his father used to go on missions a lot for the Military Power of Hifei.
Isachi grew up with his brother, Daisuke, and the two competed a lot for practically everything, always fighting against each other to find out who was the best between the two.
Their father, seeing that the two had a lot of enthusiasm for this, decided to train them from an early age in martial arts, and took them to the ancient masters of Hifei.
One of the masters, called Kyofei, taught the boys how to fight, and trained them to learn the basics of the Aura, but they didn't let them use it in direct combat among themselves or against other students, until they understood its true energy. Isachi had discovered some of his energy, like an internal fire that was ready to ignite.
When they turned 17, to test their powers, Kyofei prepared a fight between the two, so that they could finally travel the world and show the results of their training.
In combat, both proved to be experienced and extremely skilled, but at one point in the fight, Isachi managed to knock Daisuke out, getting close to the end, but something unexpected happened. Daisuke got up again, managing to knock Isachi down momentarily, with extraordinary strength, but this was making him lose control.
Isachi manages to bring him back to the surface, striking him with a fire attack, awakening his power for the first time.
After this incredible fight between the two, the brothers were allowed to travel the world and discover new powers, or new experiences, however, they were prohibited from using their powers, unless it was to protect each other.
Isachi and Daisuke then ended up arriving in Grom to participate in a martial arts tournament, where they could have the chance to meet one of the great Oracles, and here is where their stories intersect with Gotan.