Maaya's official site was recently updated with a splash page for her upcoming single. If you click on the umbrella, there are additional links for the Ame ga furu promo video and a video message from Maaya. I'm surprised there is a PV for Ame ga furu. After listening to the full version of the song, I'm totally hooked. The music composition is superb and of course Maaya sounds great. Here's an embedded video of the PV someone already uploaded to Youtube.
On a related note, Kurogane no Linebarrels episode 1 just aired in Japan and I've also listened the TV version of Ame ga furu. It sounds mostly the same as the full song, but the differences between the two are quite obvious. I've posted mp3 and streaming versions of the TV edit below.

