It is actually a well-crafted story. There is a build up tense, an unreliable main character who got pressured a lot, stupid best buds concept and trust issues due to guilt-tripping.

Things started to jumble up after Yosuke attending a high school reunion where he met his trio best buds. They came with a plan to gang up their old teacher who punished them during high school. The plan went smoothly until the teacher was founded dead. The best buds began to suspect each other. Yosuke thought he knew his best friends well but then he realized there were more things waiting to be unfolded.

Yosuke was a messed-up character. He experienced too much guilt due to his past. And yes, his friends were definitely more problematic. As the story goes, you can't trust anyone. They were the antagonists. Everyone acted their parts well. If you are rooting for good acting by brilliant actors, this one worth a shot. Kiichi and the female flirtatious teacher will make your blood boils.

I probably had guessed where things had gone wrong but I enjoyed the mystery and suspense.