So several things to mention:
- There's currently some bugs with the 2.40 version of the game, they're planning to release a new one soon alongside more H-scenes and I believe more date options in the festival. So any bug you're encountering right now is because of the new version most likely, wait until 2.41 comes out.
- The English patch can be used with the 2.40 version, though some plugins have been disabled, and others you'll have to temporally disable for specific parts (like fighting against the Reaper to unlock a new race). Beware that the English patch may create some bugs as it's not that long since it has been released and there may be some things that could have been missed.
So basically, wait for a month for the bugs to be fixed, don't lose your original saves just in case. Also one last thing:
- The Demon Lord Cassandra I mentioned before, apparently it can be recruited. It's a LoC only monster, once you beat her she will join your party. Chances are we will probably get more units that are only recruitable in the LoC, like a what if Cassandra managed to become the Demon Lord.