I need help with destitute Japanese sister in law?

My wife's sister is Japanese and lives in Tokyo area. Ten years ago her husband "divorced" her and their three children by just moving out. He is on social security and has an income, she had three young children and had never worked. My wife says that in Japan a man can renounce his family and not be responsible... show more My wife's sister is Japanese and lives in Tokyo area. Ten years ago her husband "divorced" her and their three children by just moving out. He is on social security and has an income, she had three young children and had never worked. My wife says that in Japan a man can renounce his family and not be responsible for their care by just leaving. Surely this society is better than that. Anyway, she has had to work but only finds part time jobs and does not earn enough to support all of them. Is this legal. Are there no social service agencies there that I can direct her to see?
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