Hoshino was born in the Alola region. His parents were famous and powerful trainers and researchers. He lived a very happy life, but his peace came to an abrupt end when Hoshino Kai was seven years old. A powerful mysterious organization coveted the research results of his parents and was preparing to capture Hoshino and threaten his parents.
In order to prevent Hoshino from being taken away and to protect the research results, his parents resisted desperately.
Amidst the flames and explosions, Hoshino's parents fell...
From then on, Hoshino became an Alola orphan and embarked on the road of revenge. In the end, he defeated several others among the eight masters and won the strongest championship.
