A strong-willed, skilled with a gun, and a skilled cleaner (sleeper) known as Benigumo, who calmly completes the jobs he is asked to do, is known as Benigumo. According to the middleman Kisaragi, this job is quite difficult. Benigumo breaks into the hideout... and a mysterious man awaits him. Is it a trap? What will become of Benigumo, who is now in a difficult situation?