Set in the city of Nagasaki, the story takes place in a world where a miniscule amount of magic remains in everyday life. Hitomi Tsukishiro is a 17-year-old descendant of a witch family 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 witch, sends Hitomi to past, the year 2018. Through exchanges with her 17-year-old grandmother and her club members, the story follows Hitomi's growth as a person.