Jet King 

Atsushi, a fourth-grade elementary school student, is a daydreaming and absent-minded boy who often dozes off. One day, during a math class while searching for a ruler, he is astonished to find that his hand has transformed into a ruler. From that moment on, he realizes that he can transform into anything he envisions in his mind. Together with his friend Yoshi,, whom he confides in, they discover a strange beetle and a family tree hidden in Atsushi's house, leading Atsushi to learn that he is a descendant of aliens.