Konohana: True Report

This is the first game in Konohana series and takes place in a high-school, featuring Meguru Momoi as a protagonist, a second year student who just moved to Konohana high-school. As things would have it, what you thought to be the peaceful period until the graduation turns into a suspense thriller. The teacher has been killed, and together with Miako Tachibana, a second year student who is part of a school's newspaper club, you end up entangled in trying to solve the mystery behind the series of murder and the "Legend of Grim Reaper".

[from MobyGames]