Since it's not really clear, numbers 1 through 3 can be purchased on Android market.
I thought it was pretty cool and ended up buying all three. Most of the stories are good though one chapter in the first vol was a fanservice story that was pretty boring and was dropped thank god. I was happy to see that the translation read naturally.
But the "app" is pretty primitive, since all you can do is turn the page and zoom, and it doesn't remember your zoom setting or where you are if you want to stop and resume. And if you change orientation it sends you back to page 1... Oh, and it takes up 6Mb and can't be moved to your SD card so I guess you read it and delete it.
Still it's better than Kindle where you can't zoom at all so sometimes you can't even read it. And $1 a chapter is way better than the $3 Libre is charging.