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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. <br><br> (Source: Anime News Network)
AnimeLok is the best site to watch Planetarium Uchuu Kyoudai: Itten no Hikari SUB online, or you can even watch Planetarium Uchuu Kyoudai: Itten no Hikari DUB in HD quality. You can also find Sunrise anime on AnimeLok website.
