A veteran detective who is trying to uncover the truth behind the serial cases of mysterious deaths that occur every year in Hinamizawa. He's working hard to try to solve this case before he retires, but there are a lot of villagers who resent the fact that he's investigating this case. Residents who have been in contact with Ooishi have disappeared due to Oyashiro-sama's curse, so he's known as "Oyashiro-sama's messenger" and is feared... [From Kuraudo Ooishi on 07th Expansion Wiki]