Spring, 1923. Haru Shimazu runs away from home after a quarrel with her father, and is struck by lightning on a bridge. When she comes to, she finds herself in Tokyo one hundred years later, in the year 2023. Seita Hoshitani, a high school student of the same age as Haru, protects her when she falls unconscious. At home, together with her older sister Shuri, Seita hears about Hal's situation, which is hard to believe...? This is a story of a Taisho maiden who searches for "the way I should live" beyond the times!