VITA Sexualis

While delivering a confidential device known as the VITA system to his coworker, Shirou encounters Amane Mao, a girl with immense strength. The VITA is a weapon designed to combat ERRORs—massive cybernetic mutants responsible for the destruction of Old Tokyo fourteen years ago using weapons of mass destruction. An ERROR suddenly appears and attacks, and after Shirou's failed attempt to persuade his colleague to approve the VITA's use to protect civilians, she is killed. With no other option, Shirou agrees to Mao's request to activate the VITA and destroy the ERROR. His experiences as the male operator of the VITA system at St. Liddel's Girls' Academy are about to begin.