Undercover agent Erika Hoshizaki, codenamed Brusela Striker, belongs to a special government agency and receives a new mission: infiltrate Togurokai, a terrorist organization posing as a martial arts group. She passes the initiation test by demonstrating strength impressive enough to convince the leader, Hiruma, and successfully completes her infiltration. One after another, she thwarts assassination attempts and stands against the organization's conspiracy. However, Togurokai sets a trap targeting one of its members, a lawyer, and captures Erika. Though she has faced every form of torture without flinching, Erika gradually loses composure under Hiruma's lewd molestations of her beautiful body—possibly triggered by past trauma. Overwhelmed by relentless waves of sexual pleasure she cannot resist, the cool expression of Brusela Striker begins to twist in ecstasy... Ultimately, this battle reaches its HAPPY END.