Mother Goose no Himitsu no Yakata

Erika Fleur wakes to find a book on her shelf glowing — a collection of Mother Goose nursery rhymes given to her by her grandmother and long forgotten. She opens it and is immediately transported to a mansion, where five men introduce themselves as the book's inhabitants. Mother Goose herself is there too. She explains that because the world has forgotten about them, Erika must pass a series of exams on nursery rhyme content before she can return home.