Eika lives with her beloved husband Mitsuo, her father-in-law Masataka, and her brother-in-law Mitsushi. Mitsuo cares not only for Eika but also for Masataka, who lives on his pension, and Mitsushi, who is job hunting. He is an indispensable presence in the Yûki household. One day, Mitsuo disappears without a trace. No good news comes, and the Yûki family falls into darkness as if they have lost the sun. Especially Masataka's despair is intense. Unable to bear seeing him like this, Eika vows to protect this home until her husband returns…
