Blood+ Souyoku no Battle Rondo is an Adventure game, developed and published by SCEI, which was released in Japan in 2006. Player assumes a role of Saya Otonashi — an ordinary schoolgirl, who suffers from amnesia. Upon being attacked by a Chiropteran she learns that she's the only one who can defeat them. She engages in a journey with her family, allies, and her chevalier Haji, to defeat he Chiropterans and recover her identity.