Great question — answering as the UphillTech team:
I think the most simplistic answer is that before the Anime production was to be aired, the studio had tied up with the production houses Crunchyroll and billibilli. On 5th Jan, Anime News Network had the following article http://www.animenewsnetwork.com/daily-briefs/2016-01-05/ojisan-and-marshmallow-credits-list-crunchyroll/.97209 The official website for the television anime of Rekomaru Otoi's web manga Ojisan and Marshmallow (Ojisan to Marshmallow) lists media distribution service Crunchyroll and Chinese streaming site bilibili as being in charge of foreign business for the project. The next day, crunchyroll confirmed this news....
Full answer by Arcane: https://anime.stackexchange.com/a/39107 (CC BY-SA 3.0).
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