Set four years before the events of the Space Brothers TV series, Space Brothers #0 tells the story of two brothers on disparate paths. Hibito Namba is a rookie astronaut in training while his brother, Mutta, has found his own ambitions at a disappointing standstill. When Hibito is selected to train for a coveted NASA space mission, it sets in motion a series of events that takes the brothers to the crossroads of destiny and dreams.

(Source: Sentai Filmworks)

Alternative Titles: Uchuu Kyoudai: Number Zero, Uchuu Kyoudai: Nanba Zero, Space Brothers # 0, 宇宙兄弟#0[ナンバー・ゼロ]