Job-hunting Daisuke heads to the Antiquarian Bookshop Biblia in Kita-Kamakura with a book signed by Natsume Soseki that his deceased grandmother left behind. He asks the beautiful shop owner Shioriko to authenticate the book. However, the book in question hides an unexpected secret from his grandmother.

Fukuura Koharu works at a child welfare office and plunges into despair overnight. Then she meets Daigo, a private-practice doctor raising his 8-year-old daughter on his own. She resolves to build a happy household, but things don't go as expected.