hmmm, as far as I know spiders aren't a huge problem in Japan. Of course there are many of them, but I think there's only one really poisonous one: the Redback Spider.
Quote:
"Media in Japan have reported the discovery of Redback spiders in Osaka, Japan within a hundred kilometres of Kansai International Airport. It was speculated that they arrived in Japan by "hitching" a ride on the outside of airliners, or carried in cargoes of wood chips.[10] In 2008, Redback spiders were found in Fukuoka, Japan. Over 700 have been found near the container terminal in Hakata Bay, Fukuoka city. Warning signs about Redback spiders have been posted in parks around the city as Japan has had no poisonous spider before now."
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It seems one of the more common spiders in Japan is the "golden orb weaver"
Which aren't lethal, but still poisonous.