To the Developer/Publisher:
If there was a Steam bundle for all 3 games (4 after Hiver(Winter) arrives), that would avoid confusion and let people see the full breadth of this series. It's a beautiful VN series and more people should be introduced to it as a whole. In my time, I've never encountered a 4-part Mystery VN series with Yuri romance. This makes Flowers something special and I highly, highly recommend making a bundle and updating the icons for the Steam store and Steam library.

And to any new fans reading this, here's the order of games. Also Printemps has a demo:
1) Flowers: Le Volume sur Printemps
2) Flowers: Le Volume sur Été
3) Flowers: Le Volume sur Automne
4) Flowers: Le Volume sur Hiver