Bee Train

Bee Train Production (ビィートレイン株式会社 Biītorein Kabushikigaisha), commonly referred to simply as Bee Train, is a Japanese animation studio founded by Kōichi Mashimo in 1997. Since their involvement with Noir, .hack//Sign, and Madlax (among other series) they have a strong following in the yuri fandom for being involved in series portraying strong female leads with speculatively ambiguous relationships.