the fuck do you mean "until then" you both know the afterlife is real, you have been there, why would death stop you
there are several circumstances that can prevent them from being reunited afterword, but it might just resolve to them being in the Netherworld together.
Hey, Reimu~What?We're gonna die some day, right?...I guess.Unlike youkaiWe're humans, after allOni MikoUntil then...... We'll always be friends......
......right?Dumb ass.Stop worrying. Of course we will....I see.Ouch