is one of the Reel Anime 2010 season put on by Madman and is definitely
worth a look.
It does have a major logical hole around a single point of failure
that did jar my suspension of disbelief somewhat but the characters are strong enough to carry it through.
This film is essentially a celebration of families that you can't live with, and can't live without, as viewed by an outsider who doesn't have a family like that.
From the same people who made The Girl Who Leapt Through Time
it is less challenging but more enjoyable.