Oh great, a mihoshi-incarnate for Mara's angel.

Great save with the nature of the angels. Have you retrofitted this info
onto the first part?

I wanted to advise you to write about the differences between the angel
types in the fic itself instead of an explaination at the end. But I
realised that you don't know that much about the angels right? That's ok,
just let the readers be aware that there is a fundamental difference. You
should put this in the scene where Joan & Peorth are talking. And really, I
don't think anyone would rename a Seraphim class angel. It doesn't fit in
with the attitude of Heaven. If you need more info on the angels, you should
check out this site:

http://www.geocities.com/Tokyo/5142/

select characters on the box at the bottom.

Megumi is only a year younger than Keiichi. if he has graduated, married and
has a family, Megumi should be graduating soon too, like in the next few
months.

Also, how old are the twins? You gave the impression that they were
newborns, only a few months old. You really think it's ok to let someone
else take them out of the house? On another note, if the babies are more
than 5 months old, it's all but certain that Megumi should have graduated
already. This is of course assuming that Keiichi married AFTER he graduated.

Smart of Keiichi to buy a car. He'll be needing it with the size of his
family. Even with just 2 children, he'll be needing a minivan to comfortably
transport all 6 members of his family!

As for being an energy drain, I don't know. It was never mentioned just how
much energy it took to power an angel, but I get the impression that the
angels were a way for the goddesses to use their full powers without using
up their own energies.