Suddenly, the war against the "Outsiders", also known as the "IW Calamity", that appeared on Earth ended with humanity's victory. Peace returned to the world. During the recovery efforts, I, Momozawa Motoo, am chosen as a close aide to a certain someone: the former savior who led humanity to victory with her ability to foresee the future, called 'Future Sight'—Kamitarai Mio. Upon our first meeting, she suddenly declares, "It seems we're getting married in the future, you know?" Thus my daily life with her begins. At school, we hide our true identities and act as lovers; after school, we live together as neighbors. In this lively and enjoyable daily life, I gradually come to know Mio as a person... This is an ordinary love story with a former savior, set in a world that has finally found peace.