Tae Ukishima works at the front desk for a company. Her dream is to marry a competent man and live as a housewife. Her boyfriend is Shunpei Shiraishi and he works at the same company. They have dated for the past year. To marry him, Tae Ukishima pretends to act like a naive and shy person in front of him. Her real personality though is to speak frankly and making sharp remarks.

Tae Ukishima wants to relieve her stress and she decides to purchase Jun Setsuna as her boyfriend. To pay off his debt, Jun Setsuna becomes an obedient boyfriend to Tae Ukishima.

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.