Onigiri Sasa

Onigiri Sasa (おにぎりささ) is a manga series by Sankichi Meguro. It was serialized in Comic Earth☆Star. A sequel called Onigiri Chisa (おにぎりちさ) is currently serialized in Comic Earth☆Star.

Plot
School girl is trained by a secret branch of the police to detect and to kill demons disguising themselves as humans.