On rainy days, Hina Katagiri has dreams about her younger self playing with a mysterious boy. Hina is a busy high school student, her schedule filled to the brim with club activities, but one day, she finds herself in the same garden she had dreams about. A young man, Takaaki Hongo, mistakes Hina for his fiancee, Hinako Kitamine. Thinking she probably zonked out at school and this is all a dream, she plays along. The ruse comes to a head when she meets her doppleganger, Hinako, and Hina comes to the startling realization that she has been transported back in time to the year 1907.