Sora Yoshiro was enjoying her normal life until she met the new student Yoh. Sora and Yoh end up stuck with each other and starting to have emotions for each other, while on the other hand beast creatures that come out to kill has roam around in Sora's street. Yoh and Sora go on bloody adventures to end all these killing in the street. but little did Sora know she has a special power within her blood!