Next month the biggest manga in Jump Comics releases is SnS and I think there will be an interesting battle for second place
BC (currently have 27 episodes out) vs DarliFra (currently have 14 episodes out)
judging by the last volume sales Black Clover #15 (226,022) vs Darling in the FranXX #1 (129,262) it suggest it will be an easy win for BC since it sold 100k more
but I dunno, if Jump gives DarliFra a bigger print than vol.1 i think it could easily close the gap and come close to overtaking it
I know it got reprints but we will have to wait and see how big those were actually were