Keika lives with her beloved husband Mitsuo, her father-in-law Masutaka, and her brother-in-law Mitsuji. Mitsuo is always looking out for not only Keika, but also Masutaka, who is living on a pension, and Mitsuji, who is job-hunting, and is an indispensable presence in the Yuki household. Then, one day, Mitsuo disappears. No matter how long they wait, no good news arrives, and the Yuki household becomes gloomy, as if they have lost the sun. Masutaka is especially depressed, and Keika, unable to bear to see such a state, vows that she must protect the house until her husband returns, but...