Kuma Miko: Girl Meets Bear Vol. 4 (manga)

On a day just like any other, a corpse washes up in the river that separates Kumade from Tamura Village. The victim was a resident of Tamura, so the detectives, considering the long history of antagonism between the villages, suspect someone from Kumade. The detectives look around the village for suspicious characters, and soon their hunt leads them straight to Kumade Shrine!