Xiaomi, a third grade pupil, has many worries and wishes. He makes a wish to the starry sky. Yoyo passes by him and hears his wish. Yoyo, who is from the meteor cosmos, has the ability to come and go freely between planets and help others realize their wishes. Xiaomi takes Yoyo back to his home as a friend. Since then, Xiaomi’s life has begun to become very interesting. Through his ability to move instantly between planets, Yoyo seeks for various kinds of magical props to help Xiaomi realize his wishes.