Injuu Gakuen La☆Blue Girl: Fukkatsu-hen
English name: La Blue Girl Returns
Genres: Hentai
Type: OVA, Episodes: 4
Aired: May 25, 2001 to May 25, 2002
Studio: Arms
Source: Manga
Rating: Rx - Hentai
Synopsis:
A race of butterfly-demons named the Mahoroba want to enslave Miko Mido and her sister to steal them the seal case that control the Shikima. Their ultimate goal is to conquer the Shikima Brain, a legendary place of the Shikima realm which is said to confer the power to rule the universe. 

(Source: ANN)