Need to thank Rinnosuuke for providing the glasses

With Mokou, the oath of being with her "forever" take a literal sense.

FRien said:
With Mokou, the oath of being with her "forever" take a literal sense.

That depends on your point of view. The oath is "till death do us part", but it says nothing about the death needing to be permanent.

Nothing implies death automatically does a couple apart. Trust me. With Mokou it definitely won't.