Muteki na Okota

Okota is a young woman who works as a live-in maid for a wealthy family. She is cheerful and diligent, but she has a secret: she is completely invincible in combat. No matter how many times she is attacked or thrown into dangerous situations, she always emerges unscathed and victorious.

One day, her employers' son, a spoiled and arrogant young man, becomes obsessed with proving that he can defeat her. He devises increasingly elaborate and violent schemes to try to break her spirit and her body. However, Okota's invincibility turns every confrontation into a one-sided affair, leaving her attacker humiliated and frustrated.