Board Thread:General Discussion/@comment-25267842-20150227003813/@comment-162.222.145.161-20150227054810

It only work with Spirits sommoned with Destiny Orb, Advanced Summon, Limited Summon and Neo World Summon.

Don't know if it will be apply to the normal R and SR, but in the next update, they plan to do the same for the UC normal summon, passing them from 35 to 45 max lv.

Hope that answer your question.