Suzuki is just an ordinary man until his wife is murdered. When he discovers the criminal gang responsible he leaves behind his life as a maths teacher and joins them, looking for a chance to take his revenge. What he doesn't realise is that he's about to get drawn into a web of unusual professional assassins, each with their own agenda.

The Whale convinces his victims to take their own lives using just his words.
The Cicada is a talkative and deadly knife expert.
The elusive Pusher dispatches his targets in deadly traffic accidents.

Suzuki must take each of them on, in order to try to find justice and keep his innocence in a world of killers.