so it looks like Please Stay with Me has a tie-in, and it looks like it'll be the insert song to matsumoto jun's new drama, Natsu no Koi wa Niji-iro ni Kagayaku, which will be airing on july 19.
source:
http://community.livejournal.com/natsuniji/7588.html
YUI will also be singing the theme song as well, but i don't think it's 100% confirmed yet. but i'm still so happy! this is great promotion for YUI!