[Girls attack! A new kind of omega-verse is born! --Nana Kitano, an alpha who is in the highest class of athletics, studies, family background, and appearance. Her family's custom requires her to have an arranged marriage with an omega, and her goal is to destroy the match. She wants to decide who she will marry. With this conviction, she goes to the arranged marriage venue to break up the marriage, but the person there is Kazuki Haihara, a teacher at her school. Shichi is surprised by this unexpected partner. However, she gradually becomes attracted to the teacher...?