|(肥土桐也, Hido Kiriya)|
|Appears in||Manga only|
Kiriya Hido (肥土桐也, Hido Kiriya) is a serial killer and also the former student of the now deceased Hidemichi Mizuki during his high school years. He got arrested in a internet cafe, which was first though that he was the one responsible for killing Hidemichi.
He got probably blonde hair and a muscular face and body and has also a stubble. He has also a furious appearance, which he looks really angry or put fear into peoples he stare at.