Lazy Lily Scans:
"Before you start confusing yourselves, this is chapter 9 from VOLUME 03. Yeah, that’s right, this chapter takes place after Sakura Trick TV episode 12. As we mentioned before, we will skip the volumes 2-3, so that the Sakura Trick goodness will continue on after the anime (and also gives us a head start just in case DEEN decides to make season 2)."
I'd say go watch the anime for the inbetween chapters, but why the heck wouldn't you have watched it yet. Unless you're a yuri traitor, you yaoi fans.