River's Edge (2018)

Original title: リバーズ・エッジ

An unknown dead body left by the riverside leads them to sharing a secret and creating a distorted bond.

Haruna Wakagusa is a high school student who lives with her mother. Ichiro Yamada is gay and Haruna’s classmate. He is bullied at school, but Haruna sticks up for Ichiro. They become intimate and Ichiro tells Haruna his secret. He found a dead body along the riverside. A new body is soon found.