A peculiar incident occurred in the Kamata family. Two weeks ago, Mom disappeared after a fight with Dad. While Dad and Shiho don’t have the slightest idea where Mom has gone, 13-year-old Kojiro knows her whereabouts. He helped her to hide somewhere in the house. Mom can only truly feel at home during the daytime when Dad is at work and the kids are at school. Kojiro and Mom share a secret signal. Then, one day, after they have gotten used to living like this, Dad comes home unexpectedly during the day. Does the quarrel between Mom and Dad have no end?