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Babel. It isn't entirely Japanese, but concerns many different characters in several different continents all connected by a single event.
English, Japanese, Spanish, Moroccan, and a few other languages I'm probably forgetting.
One of the characters is a deaf Japanese schoolgirl who lives in Japan with her father after her mother killed herself. Features not only Japanese, but also Japanese Sign Language.
I highly recommend it, Inarritu's best imo.