Quick Answer
Planetarian: The Reverie of a Little Planet is streaming on Crunchyroll. 5 episodes (~2h total watch time). Availability may vary by region.
Where to Watch Planetarian: The Reverie of a Little Planet
Planetarian: The Reverie of a Little Planet is currently on Crunchyroll. Keep in mind that catalogs change by region — if you don't see it on your usual service, check the other platforms listed here.
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About Planetarian: The Reverie of a Little Planet
It is thirty years after the failure of the Space Colonization Program. Humanity is nearly extinct. A perpetual and deadly Rain falls on the Earth. Men known as "Junkers" plunder goods and artifacts from the ruins of civilization. One such Junker sneaks alone into the most dangerous of all ruins—a "Sarcophagus City." In the center of this dead city, he discovers a pre-War planetarium. And as he enters he is greeted by Hoshino Yumemi, a companion robot. Without a single shred of doubt, she...
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Where can I watch Planetarian: The Reverie of a Little Planet legally?
Right now, Planetarian: The Reverie of a Little Planet is on Crunchyroll. That said, anime licensing varies a lot by country — what's on Netflix in Japan might not be on Netflix in the US. If your go-to platform doesn't have it, try the other services listed above.
Is Planetarian: The Reverie of a Little Planet on Netflix or Crunchyroll?
It's confirmed on Crunchyroll. Netflix availability depends on your region — some countries have it, others don't.
Is Planetarian: The Reverie of a Little Planet available with an English dub?
Dub availability depends on the platform. Crunchyroll has been expanding their dubbed library a lot recently, and Funimation (now merged into Crunchyroll) historically had the biggest dub catalog. Check each platform's listing for Planetarian: The Reverie of a Little Planet.
Can I watch Planetarian: The Reverie of a Little Planet for free?
Crunchyroll offers a free ad-supported tier for some shows. Most other platforms require a subscription, but many offer free trials for new users. Tubi and Pluto TV occasionally have anime in their free rotation too.