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A group of high school girls is Copper Dimension's last defense against the dark forces. They signed a contract with Xiong Ya, a guardian of light, to protect the innocent with their lives in exchange for having one wish come true. When one of their own is killed in school, their hunt for the devils in human skin brings them face to face with their own inner demon. They soon discover they are not above the influence of evil.

Izumi Noda, a librarian who prefers being surrounded by books rather than being in contact with people, meets Latin Yoneya Nell, who aims to become an architect with a joint party taken by Kumiko. I'm puzzled by Nell who visits the library every day from the next day, but I was timid for love for some reason. I'm attracted, but I know that Nell approached the fountain was a game among friends.