Chiropteran – is an un-dead monster with a grotesque figure, however it can disguise it's self as a human and sucks people's blood. There is a secret organization called Red Shield, they exist to hunt down the Chiroptearns.
It is the year 2005, in Okinawa. A high school girl Otonashi Saya spends her life peacefully, she seems normal but the only thing about her is that she lost all her memories a year ago. Her perfect life ends with a accident.
She meets Hagi, who's in a black suite playing a cello, he gives her a Japanese sword. At this moment, history turn a new page.
Will Saya remember about her past?
