In late November, Kelvin Young, who was visiting Japan from California with his family, left his 5-year-old and 2-year-old daughters with a nanny at their hotel. For about four hours, he and his wife enjoyed a visit to a high-end sushi restaurant in Tokyo that is not well suited to families with young children. The next morning, their daughters excitedly showed them the crafts they had made during that time. The childcare service was provided by Synk Inc., a company based in Kamakura, Kanagawa Prefecture, that employs nine English-speaking nationally certified childcare workers and one nurse.