Ginga Tetsudou no Yoru

What is true happiness? For Giovanni, the answer is as far away as the stars. Mired in hardship, the young kitten faces problems that should be unknown to someone his age. At school, his classmates mock and ridicule him, and after the bell rings, Giovanni toils at a job to earn enough money for bread. Then at home, instead of being taken care of by his mother, he must take care of her. The sole bright spot is that of the Festival of Stars, where he hopes to run into Campanella, his only friend. When they finally meet up, however, it isn't while looking up at the stars, but rather traveling amongst them... as the Galactic Railroad whisks the two away for parts unknown!

(Source: Discotek)