Maybe eventually. But in the short term it means his moving away to live with his father and its going to be a long distance releationship with Nanami, if all goes well they should meet again after a 3 to 10 year time skip.
Bit cliche really.
Quite the fool isn't he?
How does this help Kokoro? There is no way around the fact that she will eventually need to feed off other men. When that day comes he could either of been there for her as a husband or nothing more than a fading memory, one is obviously better than the other.
If they are both demons they will need to sleep with other people. Less than ideal but its better then Takeshi dropping dead within a century and leaving Kokoro a widow for the rest of her long life.
Much like apathy, a series being licensed by seven seas is death. Is anyone going to even remeber this series by the time it takes seven seas to catch up at their leisurely pace?