Yumiko Kobayashi

One day, a woman named Chiyome Hesogakure with a child named Chinzō visits the Nohara family and claims that she is the real mother of Shinnosuke and takes him away to a Ninja Village. ...

When the five visit a private academy Kazama is attacked. He is left with reduced intelligence and strange bite marks.

At the Death Weapon Meister Academy, three teams must collect the souls of 99 evil humans and one witch.