(The protagonist is a female, and the world view is a bit complicated. You can take a look at the final world setting first.) Yi Erben is an ordinary college student with an ordinary major. He has a celebrity sister Yi Yiyi who is the gym leader. Yi Er, who was not very interested in Pokémon at first, had to become a trainer because of Yi Yi Yi's death. And Yi Yiyi's missing body seems to indicate that things are not that simple.
