Pharmacist Saki, timid policeman Shingo, and toilet-cleaner Tetsu find their lives turned upside down when their bus is hijacked by a crazed businessman. Months later, Tetsu talks Shingo into a unique business venture: revenge-for-hire. Anyone with a problem can come to them and they'll take appropriate, vengeful measures. Meanwhile, Saki, disillusioned and increasingly anti-social, also wishes to take out her own revenge on society.