Keima orders Elsie to go to the school library to learn modern human history after learning her knowledge about human history is two centuries out of date. Instead, she becomes fascinated on a book about Firetrucks. When she looks for more books about Firetrucks, she ask one of the librarians, Shiori Shiomiya and detects a spirit inside of her. After bringing Keima to library, the two are amazed that Shiori manage to find 458 books related to Firetrucks. While Keima thinks Shiori used the library index, Shiori, deep in thought, wants to tell him she was able to find them as she remembered all the books she reads in the library but is too shy to speak up. The next day, Shiori arranges the books in the library and explain her love for books. Keima is aware how shy librarian girls like her are easy to figure out as they are a common character in games but unlike games where he can read what the character is thinking, finding out what Shiori thinks might be more harder. As Shiori removes some books to be dispose off and laments to herself about their fate, Keima helps her get one book she can't reach. Shiori tries to think on how to thank him but fumbles in her words while thanking him.
ケーキを作れば大爆発！人間界の知識もてんでダメなエルシィに辟易した桂馬は、一般常識を勉強させようとエルシィを図書館へ。
膨大な蔵書数を誇る舞島学園の図書館、カッコイイ図鑑を見つけてはしゃぐエルシィだが、受付で図書委員の少女・汐宮栞に駆け魂の気配を発見！
とっても大人しくて無口な栞。仲良くなるどころか、おしゃべりするのも一苦労で……。
케이크를 만들기만 하면 대폭발!인간세계의 지식이 아예 없는 엘시는 케이마에게 화가 나서 일반 상식을 공부하러 도서관에 간다. 방대한 장서를 자랑하는 무도학원의 도서관에서 멋진 도감을 찾아내 까불며 떠들던 엘시는 접수대에 있는 도서 위원 소녀에게서 카케다마의 낌새를 발견한다!아주 얌전하고 과묵한 소녀. 하지만 그 소녀와 사이가 좋아지기는 커녕 이야기 하는 것도 상당히 힘이 드는데…
Debido a la falta de sentido común del mundo humano de Elsie, Keima la envía a estudiar a la biblioteca. Allí, Elsie conoce a Shiori, la tímida bibliotecaria que tiene un alma perdida y se convertirá en el siguiente objetivo de Keima.
