Dare ga Okudera Shou wo Koroshita no ka?

The story is set in 1995, and centres on the murder of the titular character Okudera Shou, a boy who lived in a remote provincial town divided by small-time territorial gangs. Shou was bullied and taken advantage of by the gangs even as they began to behave strangely, indicating a shift behind the scenes.

(Source: Kodansha, translated)