Uchuu Kyoudai: Itten no Hikari
プラネタリウム 宇宙兄弟 ～一点のひかり～
Aired: Jul 21, 2012
The anime's original story features Mutta and Hibito during one summer when they were children. During the summer when Mutta and Hibito made their promise to go to space, they met a young girl who also had a wish. (Source: ANN)
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