Next event with Heart of a Foreign God

It's probably this month with the rerun of Moon Goddess. The event store packs 10.

rerun of moon goddess this month and next month Shinjuku comes out where you can farm them more regularly than just the chance on fridays

Moon Goddess is actually due in the next couple weeks. We get the King Hassan banner immediately following new years and then right after is moon goddess rerun. The shop itself has 10 hearts and the lvl40 free quest drops 3 on the first clear, and then thereafter there's a demon in the node that can drop them at a decent rate. That's the best time to farm for hearts until shinjuku comes out with a permanent node.

Yes, thank goodness for the upcoming event and Shinjuku. I am needing so many hearts (like 150) and that Caster node sux.