Milkyway?

So, I didn't see a big info/announcement page for Milkyway... Is that just an art book? Is there any stories or chapter list?

Thanks for info and total agreement about the artwork.

There's some comparison shots of the artbook next to the Titikei book, if you want to take a look at them.
https://www.fakku.net/forums/front-page-news/love3-free-demo-ishikei-artbook

The art looked so good, I ended up just buying it... No regrets.