Female sniper "ANN" is a brilliant scientist who, after tragically losing her beloved older brother to an enemy nation, vows revenge and chooses the path of a sniper. Sent on an assassination mission by the military, she infiltrates enemy territory only to fall into a trap and suffer a brutal rape. Her body becomes the target of numerous pleasure-based tortures and vicious sex devices under the guise of human experimentation. Overseas sadistic devices from the BDSM specialty shop "The Tarantula" assault her, and a merciless fucking machine appears, penetrating her two holes with powerful torque, repeatedly forcing her into intense orgasms and delivering ultimate ecstasy.