Title: Tenjou Tenge: The Past Chapter
English title: TenjhoTenge: The Past Chapter

Mitsuomi Takayanagi and Maya Natsume both want to become stronger. On there way to becoming the best they learn that there are many things going on behind the scenes, and Shin, Maya's brother, may be the cause of all of it. Mitsuomi feels that he is the only one that can stop him. A retelling of what happened in the past of tenjou tenge, in movie form. 

(Source: ANN)