I have been dreading this last episode, so I finally watched it. While it was agonizing to sit through through the moral and verbal discussions of philosophy, the only good part was the wedding ceremony and the omake at the end.

Assuming the omake is true, the setting appears to be several hundreds, maybe a thousand years finishing after denouement where Mashiro and Yachimata's descendant are finally reunited (or maybe the universes of Heaven and Earth merged together). If this happened, I wonder which girl Yuuri would have had to end up with in order to continue his lineage...