depends on the starting team you use really...
if you haven't rerolled and/or feel like you still can, there's still time to reroll into a dark team to give a boost for this event
even then, i'd farm the koihime crossover to quickly build yourself up some more if need be. gacha tickets and magic jewes might give you something lucky, and even then the fact that the crossover events are easier than they should be means there's some other stuff you can probably get too.