Nao and Kaho have had their first child, and they've decided that Nao will be a stay-at-home dad while Kaho works as an editor. Nao is determined to be a good "professional dad," but he's still learning everything that caring for an infant and a house entails. In addition to the work itself, he copes with his sudden realization that he has Asperger's syndrome, and his uneasy feelings of worthlessness over not filling the traditional male role.