Ururu, a former lawyer, has her beloved husband murdered in retaliation for her role in using the "judicial hand" to send Kuroike-gumi boss Meguro to prison. To clear her name, she turns into a female investigator and vows to seek revenge. She launches a solo undercover investigation into the new Kuroike-gumi hideout, but... she is captured by two tough-looking gang members, and her insistent "mouth" and noble "pussy" are violated at the same time...