A Lavender-haired girl named Katarina, Was one of the children who were used as an experimentation by some unknown Organization. Several years has passed, and now she is working as a maid at Edenburgh Mansion, Edenburgh are known as their Politics although the history of the Edenburgh is more than that. Her Mistress gave her an order to attend a high-school called Erythraean academy to investigate something. "What do you mean? I demand an explanation." "Oh don't worry, You'll find something interesting there~" What will she find the in her school? Her past that she have been searching for or just another false hope? And what is it that her mistress hide from her? Why does there so many questions but no answers at all? Warning : For strong language, and maybe a bit mature content.