30-year-old bachelor businessman Daikichi Kawachi encounters Rin, a girl he's never seen before, at his grandfather's funeral. Surprisingly, the 6-year-old girl turns out to be his grandfather's love child. Daikichi doesn't like children, but the cold attitude of his relatives towards Rin makes him uncomfortable. And then, the relatives' meeting to decide who will have custody of Rin begins at last...

Daikichi's cousin, Haruko, runs away from home to Daikichi's house with her daughter Reina in tow. Daikichi can hardly fathom Haruko's determination, but when he does learn her reasons, he's not a little surprised by how strong Haruko has become as a mother. It gets him thinking again about what marriage and family mean.