You definitely didn't read the title wrong, because they definitely manage to do so with them got the HD version along with Sana side story. While I did keep saying that I hope to see this available in English because of the art (And Kawamura indeed manage to make Tsubasu's art beautiful in the anime), I still can't believe that it finally happen. Anyway, apparently it'll be available in April, although Shiravune change the release time to Q2 of 2024, which is good move if we see on how slow review process in Valve can be (Especially with Amazing Grace).
Oh yes, here's the link to the Steam store of the main game and the link to the Steam store of Sana side story.