Synopsis
During rainstorms, Hina Katagiri often dreams of her younger self playing with an unknown boy, but she dismisses these as mere childhood memories. In high school, she devotes herself to club activities and cherishes a necklace inherited from her great-grandmother. One day at school, Hina is inexplicably transported to the garden of a grand estate, where she encounters Takaaki Hongou. Believing it to be just another dream, she goes along when he mistakes her for his fiancée, Hinako Kitamine. Her reality shifts upon actually meeting Hinako; Hina realizes she has traveled back to 1907 and lost her treasured necklace at Takaaki's residence. With Hinako's help, Hina continues to impersonate her to enter the Hongou household. As she spends more time there, she begins to develop feelings for Takaaki, complicating matters further, especially as the way back to her own time grows increasingly uncertain.
