Nobody Knows directed by Hirokazu Koreeda is a definite must watch. It's on Netflix, if you're wondering where you can view it with English subs. If you end up liking this film, check out his other films, they are all great as well.
litre of tears already mention so I will list some nugu movies but they really Great
1. Daisuki (だいすき)
it's about mentally disable mother that want to raise her child by herself and what she face , it's 10 episode drama it's really good
2.Binbo Dashi drama about Kind college student that got into huge debts because he can't say No to others ... started by Oguri Shun ...
my opinion on the drama I love it and highly recommend it , it got me mixed with alot of feeling the main guy is too nice and because he is so nice some people take advantage of him and he get into trouble and his debts keep increasing , eventhough he did it to help others will people he helped and got in debt because of them help him or will they watch him drown in it ... to know more watch the Drama at www.china-anime.com