Modified girls are the only ones who can defeat monsters. Thanks to the efforts of one of them, Modified Girl Makina, the original monster was defeated, and no new monsters have been born. However, many monster swarms still remain in the world and Tengetsu Town is heavily affected by monsters. Eurie, a new type of modified girl, is dispatched there, excited and in high spirits for her long-awaited first mission.

After a shocking night, Eurie realized the truth. That’s right, the residents of Tengetsu Town had mistaken her for a sexaroid! Eurie is a modified virgin. Her mission is not sex, but monster hunting and resolving the town’s troubles, she has to clear up the misunderstanding somehow! “I’m not a sexaroid, I’m a modified virgin!” But the residents continue to play with Eurie’s body under their misunderstanding. Wherever Eurie goes, she encounters erotic troubles. Will they ever believe that she is a modified virgin?!