Natto is many a foreigners’ nemesis, but this survey from @nifty into natto and tofu found that many Japanese too find rotton beans foul.
I’ve tried a few times to eat it, but I just can’t cope with the smell; fortunately my wife too hates the stuff! Tofu on the other hand is wonderful! If you want to experience a wide range of tofu cooking, my recommendation is Hakkakuan (branches in various cities) – they have full course tofu with all-you-can-eat freshly-made tofu topped as desired with sour plum-coated sesame or coarse sea salt.
Here’s four cute blocks of tofu: