Mother Goose no Himitsu no Yakata

When the story’s main character, Erika Fleur, awakens one morning, she finds that one of the books on her shelf emits a bright light. The book in question was a collection of nursery rhymes known as “Mother Goose,” Erika’s grandmother gave it to her when she was a little child. However, Erika had no recollection of the book whatsoever. After noticing that it was glowing, she decided to open it. She was immediately transported to a mansion where she was greeted by five men who identified themselves as residents of the book. They, along with the house proprietor, Mother Goose, believed that everyone had forgotten about them; hence, for Erika to return to her world, she must pass tests based on nursery rhymes.