Silver, The Trouble books are remakes of comics that Takaki Kyou did for a doujin series called Pao! a couple years ago.
The remakes have MUCH better art and also have extended story parts so they feel more finished WHEN the story finishes.
There was 3 Trouble stories through Pao!'s run so there's going to be 3 Trouble books. 1 & 2 are out and scanned, 3 is getting released this summer Comiket.