The hotel still needs him, and space still calls. This movie takes 21 Emon further from Earth, but the contradiction that made the series work, that a kid can't choose between his family's survival and his own dreams, goes with him. By the time he realizes the two things he wants are the same problem in a different uniform, he's already too far gone to turn back.

21 Emon: Sora Ike! Hadashi no Princess is a 1992 movie from Shin-Ei Animation.