Rei's father lived an ordinary life working as a janitor at Wise Corporation. One day, he accidentally discovered top-secret information and was murdered. Seeking revenge, Rei joins the National Security Task Force "SATT" to fight against Wise Corp, but she is captured by the company's deadly weapon, Z-1, and subjected to relentless humiliation and abuse. Forced to serve as a sidekick, she is made to wear a plus-sized heroine suit and endure degrading taunts from Wise Corporation employees, suffering continuous shame and degradation. The truth behind Z-1's identity brings shocking revelations, leading to a tumultuous and dramatic finale.