Set in the city of Nagasaki, the story takes place in a world where magic exists in everyday life. Hitomi Tsukishiro is a 17-year-old mage who grew up with stale emotions, as she lost her sense of color at a very young age. Feeling sorry for her granddaughter's future, Kohaku, a great mage, sends Hitomi to past, the year 2018. The story follows Hitomi's growth as a person during her experiences in the past.