There was a lot censored.
As Eclipse said, Chapter 2's plot was heavily altered to make it more "child friendly."
A piece of DLC content (hot springs DLC) was removed entirely in the English version.
Some costumes are not buyable on the English version (mainly swimsuits), and some mirage designs were altered too.
Dialogue was heavily altered from Japanese to English, and some of them forces some questionable changes in character personality:
In Ch 2, the Japanese version has Tsubasa heavily nervous about being in a swimsuit for modeling, and Touma wants to go to the photo shoot to see sexy girls. In the English version, Touma wants to go entirely for Tsubasa, as she is still nervous, but her nerves are so strong that she crashes into a pole and apologized to it.