There are a lot of these spiders around the end of summer and into autumn. I cant be sure but I think its is a female Nephila clavata, a kind of Golden silk orb weaver.
The female will sometimes eat the male after copulating, so this may well be a Jorogumo, a mythical shape-shifting creature in Japanese folklore that takes on the appearance of a beautiful woman to attract men who are then tied up an eaten.
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