Her fiance turns out to be her secret pen pal - the time is the Taisho era. When she was a child, Fujino Niikura, the daughter of a merchant family, was the only survivor of a family accident, and her uncle hated her for being a "patricide", forcing her to live alone in a detached house. Her only salvation in this lonely life was the "secret correspondence". However, one day the correspondence stopped. One bad thing after another happens, and Fujino is set to go on a blind date. With no option to refuse, finally on the day of the blind date... the person introduced to her as her blind date is her secret pen pal, Kirishima Shoyo. However, he seems quite different from when they were exchanging letters...