* Based on a seinen manga by Koyama Chuuya, serialised in Weekly Morning.

In the year 2006 the kid brothers Mutta and Hibito, on a nightly hunt for animal sounds in the local woods, unexpectedly see a blazingly bright rotating flying object in the sky, right above their home town. After a short moment the UFO accelerates towards the surface of the Moon. Witnessing this, the two youngsters vow to become astronauts and some day travel into space.

Now in 2025 younger brother Hibito, as the first Japanese, made it into the NASA team that will set foot on the Moon again. Mutta, on the other hand, defending his brothers honour, gets fired from his car designer job. The older of the two brothers has not forgotten about their dream from back then though... and on a fateful day his life changes.

— written by foo2

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Side story: Uchuu Kyoudai: Apo's Dream
Side story: Uchuu Kyoudai: Itten no Hikari
Side story: Uchuu Kyoudai: Number Zero