Superheroine Wonder Grace stands firm, staring down at the man before her with unwavering confidence. The man, Kaitani Masaki, glares back with demonic eyes. Once an ordinary man, he has transformed into a vengeful fiend and now wields the completed bio-robot weapon, Cerberus. As the machine appears before Wonder Grace, she smirks and says, "Oh my, you're well-prepared... bringing a maid robot to liven up the party." But those words quickly turn to regret. She soon realizes she let her guard down—and pays the price. What follows is a brutal, humiliating domination, marking the beginning of a cruel new chapter—[HAPPY END]