S1·E71 The Children's Limbo Pioneer

On Limbo, a planet without grass nor trees, Tetsuro and Maetel meet a man living tough life tilling the ground in such hard conditions, and his son, Yosaku. They plan to till the ground until the crops are ripe but a monstrous bird comes attacking. In order to protect him, Tetsuro and Yosaku fight the bird...