Need help with plot description of current NHK drama...

This drama/fantasy just premiered here in the U.S. on TV Japan, but I can't find a detailed synopsis of the series. It started in 02/2013 on NHK in Japan. Is anyone familiar with the storyline, or can anyone tell me what this series is all about? I think I have a general idea (a deceased young son returns home, but as various older versions of himself), though I'm not quite sure.

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Tadaima Kaa-san!
I'm back, Mom!

http://www.nhk.or.jp/drama/tadaima/