With the aid of his vivid imagination, a bullied boy (Tomonori Yazaki) whisks himself away to the fantastical Monster Island, where he makes friends with Godzilla's son, Minya, and finally learns how to stand up for himself. After the boy watches Minya take on an impressive roster of monstrous foes, the real world isn't as daunting as it used to be. But his new outlook on life is put to the test when he collides with a crew of bank robbers.