That's gotta be her father's grave. Yukari must let her visit it every so often.

WatcherCCG said:
That's gotta be her father's grave. Yukari must let her visit it every so often.

It's probably Keine's.

It's her fathers ... Keine can't die of old age...

Tensa said:
It's her fathers ... Keine can't die of old age...

Youkai and half-youkai like Keine can be killed. If Mokou is killed, she will always resurrect. As well as that, youkai aren't ageless, simply very long-lived by human standards. A million years will be less than a blink of an eye to Mokou. One way or another, unless their relationship ends/sours, Mokou WILL end up mourning her.

Tensa said:
It's her fathers ... Keine can't die of old age...

Even youkai die of old age (and Keine isn't even a youkai, she's just a were-hakutaku). Mokou is immortal and ageless, Keine WILL eventually die and leave Mokou by herself.

Its her father's, I don't really see why you guys pair mokou and keine together. My god.

IIRC, this is a cutout of a comic where Keine somehow returns to Mokou's side, so I'm pretty sure this grave is Keine's.