It took me (checks MAL) 486 days to force myself through this series. I have not watched the OVA. I don't need an extra 11 minutes† to know that I don't care for this show. Allegedly it still has yet to be either renewed or cancelled, but I hope that Studio 3Hz will move on and leave this behind. It really shows that production values alone cannot make an anime good. The writing in Sora no Method just isn't there, and no amount of moe can hide that.
Up next from Studio 3Hz is Dimension W, which will hopefully be better. (Yes, I'm way behind on anime.)
† - The OVA shows as 25 minutes because no metadata source that Trakt pulls in allows overriding episode duration. It's set at the show level, and that's what you get, period. It's too bad.
Celestial Method marks the debut show for Studio 3Hz and will hopefully be overshadowed soon for something better the studio does. Apart from the actual content the show was well done.
If there is one word that describes to show it would be: M E L O D R A M AAAAAAA. I mean what else can you expect from drama around little kids. They already pull that card with the first episode! The dynamics are weird and the saucer loli doesn't help that at all. The story is predictable and they are not even trying to spice up the slice of life. If it weren't for weekly episodes I would not have made it through this.