I never heard of natto, which is kind of surprising considering I've been vegan for most of my life. This seems like the type of thing that vegans would be into. Anyway, looks disgusting and NSFW
The natto you get from US Japanese groceries doesn't smell like anything to me. I've always wondered if it's me or them who's wrong considering how people usually complain about it. It does have an unpleasant texture, but the taste is ok if you add the mustard pack.