A cheerful and earnest housewife: Saki Hayama (45 years old). She lives an ordinary but happy life with her husband, an office worker, her eldest son who works at a major city bank, and her eldest daughter who is a university student. However, one day, the daily life of the Hayama family suddenly goes awry...! Saki fights alone, saying, "I will protect the Hayama family." Saki desperately tries to hold the family together when it seems to be falling apart, but...!? What exactly is a "family"? This human story depicts the feelings of people who live as a kind of "family" that can be found anywhere, like a curse.

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...