Board Thread:Questions and Answers/@comment-99.132.249.221-20130905192502/@comment-10300073-20130905193614

No, daemons' skills can only be increased beyond their star rank limit by fusing them with the corresponding magatama or with daemons with the same skill (although fusing daemons with the same skill is not a guaranteed skill levell up unless the daemon you're fusing away is also maxed).

When your White Angel is at her max level, you'll see that even though Kaede raised her skill level only, when White Angel's level is maxed, her skill level will still be 13 no matter what feeder or how many feeders you feed her (unless the feeder is Hare of Inaba magatamas or other White Angels).