There is a legend in this world that ghosts descend from the sky on a shooting star and disturb the human world. The naughty boy Na Chan suddenly sees a shooting star that falls from the sky. But it wasn't a shooting star, but a thing called a 'Ghost Ball'. Ghosts must be sealed inside ghost balls because they hide and make mischief in the human world. The person who seals these ghosts is called a Tamer, and the institution that trains them is the Ghost Ball Academy. Na Chan enters the Ghost Ball Academy, summons his partner spirits, and is trained to seal the ghosts through battles. Will Na-chan be an excellent tamer and protect the human world from ghosts?