21 Emon Uchuu e Irasshai!

In the twenty-first century, 21 Emon is expected to inherit Tsuzureya, the old family hotel his father struggles to keep running. Emon has a very different dream: he wants to become an astronaut. Because training costs more than the family can afford, he tries to earn money while helping the hotel with the aid of his teleporting alien friend Monga and the eccentric robot Gonsuke.

An opportunity suddenly arrives when Emon is chosen to test a new rocket on a journey around the Solar System. He eagerly leaves Earth with Monga and Gonsuke, unaware that the offer was arranged by the neighboring Galaxy Hotel as part of a plan to remove him and take over Tsuzureya. What begins as a dream flight soon becomes a genuine adventure among unfamiliar worlds.