The Secret World of Arrietty
It came out in Japan last year and will be in US theaters in February 2012.
I want to give brief story and trailer.
10cm girl Arrietty, runs into human world!!
She and her family live under the floor of old mansion borrowing human being’s materials. They have to leave when human found out about their identity. Arrietty turns 14 years old, she tries to independent girl who doesn’t ask her parents help. The first mission is borrowing sugar, in spite of interruption from mice and cockroaches, she finally successes to accomplish her work. During doing her second mission, she is caught by boy named Shou! She thinks human is dangerous, but Showu’s kindness makes her be his friend. She breaks family rule, and tries to have close relationship with Showu, but the unexpected danger is coming to her family!!!
The English trailer is available in here!!