We're just going to pretend that Japanese web design is identical to the rest of the world's, and that Japanese homes aren't half the size of elsewhere such that every horizontal and vertical service is commonly used for storage.
People who think this have actually never been to Japan, most Japanese homes and offices are incredibly messy.
It's always a clunky, awkward, boxed in mess of text that is a miracle in the case that it actually works. But that's just the way it is here. Lots of elderly, and the elderly prefer a nice helpful receptionist, I guess?