Keisuke Iwasaki is both a high school physical education teacher and a notorious vigilante known as "Rapeman" at night. Along with his uncle, a former surgeon, he runs "Rapeman Services," which provides justice to clients seeking assistance for various issues such as exacting revenge on an ex-lover or resolving conflicts between family members. Keisuke remains committed to fulfilling his contracts without hesitation, even when dealing with challenging situations like corrupt women who need to be reformed.