Monsters can only be defeated by a special existence: modified girls. Thanks to the efforts of one of them, Makina, the primordial monster was defeated, and new monsters can no longer be born. However, many remnants of monsters remain in the world. Eurii, a new modified girl, is sent to Tengeki Street, known for its high monster presence. Excited for her long-awaited first mission, she arrives enthusiastically. “I am modified girl Eurii! I will protect the peace of this city!” But the atmosphere on Tengeki Street is terrible. While Eurii tries to protect the city, the residents, as if it were a normal occurrence, grope her breasts and buttocks, subjecting her to all kinds of sexual harassment. What’s going on in this city? I became a modified girl to protect the peace of the city, but… Huh? Huh? What’s going on? Why are the residents groping my breasts?