What Led to Japan’s Deadliest Weather Disaster in Decades?

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The downpours are gone, but western Japan is still reeling from a multiday onslaught of torrential rains, floods, and mudslides that peaked last weekend. At least 176 people have died and dozens remain missing, making this the nation’s deadliest weather disaster since 322 people were killed in floods and landslides across western Japan in July 1982. Prime Minister Shinzo Abe visited the flood-stricken regions of Okayama prefecture on Wednesday, while hundreds of rescuers were still at work, days after the worst of the flooding. At least 4600 homes were flooded in Okayama, partially as a result of collapsed dikes. The rains have now transitioned to hot, humid weather, exacerbating the stress on survivors.

https://www.wunderground.com/cat6/More-175-Killed-Japans-Deadliest-Flooding-36-Years

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They just got unlucky, that's all. The meiyu front is there every year and can dump a lot of rain over the region as it waxes and wanes....add a slow moving typhoon into the mix and you get catastrophe.
Looks kind of similar to hurricane Harvey last year, that dumped 40-50" of rain over parts of Texas as it stalled.