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On housing prices? Probably nothing. Again: with sufficiently flexible market, liberal zoning regulations, and a non-broken money, immigrants can't "impact" housing prices anymore than you or I could impact steak prices by going carnivore.
Quality of life is a different story: some people don't like them around. And there's undeniably an effect in deteriorated culture/social cohesion/misusage of public services etc.
Housing prices in Japan are relatively low.
Japan has a declining and aging population with a low birth rate and almost zero immigration.
Population affects demand for housing
Regarding steak prices what if one million vegans decided to convert to carnivore? I think the price would increase
You or I can’t affect prices because we are one person. One million persons can affect housing prices especially in a small country
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