Konohana 2 ~Todokanai Requiem~

Meguru Momoi, a second-year student at Konohana high-school returns in another murder mystery adventure. He gained status of recognition after the infamous Grim Reaper murder mystery in the original game. Everything's back to normal, or so everybody thought, until one morning on their way to school, Meguru Momoi and his partner, Miako Tachibana, arrive only to see police cordoning the area of what appears to be a murder case. Thus they end up entangled in yet another series of murders case.

[from MobyGames]