There is only one sequel left need to be OVA. And that will completes all series from project Lilith...

"Kangoku Senkan II"

Note OVA (from what I know not including the original game):
-Asagi (top left with purple suit taimanin), Sakura (bottom middle with orange suit), and Oboro (top right with dark red suit) is from Taimanin Asagi. And the second season is already released on 30th October 2015
-Naomi (right side from Asagi) and Lieri (top right side from Naomi) from Kangoku Senkan. (the first season)
-Ingrid (top left side from Aishwarya Ray with blue hair and sword in her hands) and Murasaki (top middle from Lieri with pink hair) from Makai Kishi Ingrid
-Annerose (bottom middle with black suit of Alicia and Maya), Miticio (left of Sakura with maid suit), Ray (top right from Oboro), Miki (bottom middle of Ray, above Mitico and Kiria), and Mayfeng (bottom right with white chinese suit) from Koutetsu no Majo Annerose

Only sequel:
-Alicia (bottom left with dark orange hair), Maya (right from Annerose), and Kiria (middle of Miticia and Mayfeng) is from Kangoku Senkan II. Hope this sequel got the OVA...