i tend to get the hearts for 150 life crystals (100% 2nd affection does spike your stats by a lot), then save up for the skillblooms... mainly the rainbow ones

but if you got girls that can bloom (aka, 2nd evolution), get the petals they need cause they get some major boosts when you advance them.

in fact, everyone should have Evening Primrose and she can bloom. You should at least get her to lv80 Bloomed status cause she's actually quite nice.


besides, when your teams are strong enough, life crystals will pour in from the 80 stam event missions depending on how much you can play them