Since childhood, Tomita Yuri has despised boys, viewing them as devils who mock and tease her. Consequently, when her all-girl school, Kinka Academy, decides to merge with the boys' Ginka Academy, her 'heaven' is once again threatened by the devils from hell—men. To make matters worse, as a member of the student council, she is now required to work alongside the male student council of Ginka Academy. Will Yuri’s 'heaven' be overrun by these male devils from hell?