In the past, police have discovered that a gun that was used in several murder cases had a "curse" to it, and whoever wields the said weapon is unable to hold back any wild or dangerous intentions, which usually end up with someone getting hurt. With this as the root of the story, there comes Yuu Asakura, a student at a university. Yuu is a normal student. One day when he comes home he finds a duffle bag filled with money, a gun and orders for an assassination. After considering and taking the job he enters a dangerous world of sex, guns, and violence.