anNina is an experimental duo that consists of Annabel (vocals) and bermei.inazawa (composition).
Their collaboration started in 2007 with the recording of the ending theme to the anime ひぐらしのなく頃に 解(Higurashi no Naku Koro ni Kai), 対象a (Taishou a). In their songs, anNina goes for a gloomy atmosphere, with a mix that ranges from jazz to pop and classic music styles. Official web site:
http://www.voltagenation.com/annina/

Read more about anNina on Last.fm.