Just a heads up...Frontwing has gone ahead and begun posting stuff on Makai Tenshi Jibril 3. The second sequel adds another yet another angel protagonist to the crew so some form of evil conversion is almost 100% given.
http://frontwing.jp/product/djibril3/index.html
Gives us another game to watch out for now that the Himekami 1~2 fervor has begun to subside a bit...
Quick Edit...
From Wikipedia:
Another Makai Tenshi Jibril PC game is planned for 2008, titled Makai Tenshi Jibril -Episode 3- with a new character in the series, N.A.G.I.", also known as Nagi Jinno or Jibril Zero. Released materials include a new look for Hikari Jinno, and a confirmation that a major plot point will be the fall of one of the previous main characters, with her joining Misty May as your opponent.
Looks like it may end up being Hikari from MTJ2 going by the character profiles. For some reason they also decided to make her blond...aw well I've always been a Rika fan anyways.