In 2008, Mikuru, a 16-year-old high school student, often argued with her mother, Yuki. One day, a cute girl named Yuki suddenly appears before Mikuru. However, this Yuki's thoughts, memories, and body are from 24 years earlier, in 1984. Yuki has time-traveled to the present day, and upon awakening, she is amazed to discover that Mikuru is her daughter and that it is not 1984 anymore.
Now, both mother and daughter are the same age and living together in the same house along with an older man who is supposed to be Yuki's husband. While awaiting her return home, the time-traveling girl decides to uncover her future.
