If children are a country's greatest asset - Japan is coming up short. Not enough babies are being born to replace its rapidly aging population - so the country's facing a full-blown demographic crisis. There's one entrepreneur who spotted this trend decades ago - and decided to turn it into a business opportunity. Noriko Nakamura set up Poppins in 1987. It's grown into one of Japan's major providers of care services - for elderly and the children alike.