There’s definitely an aspect of suburbia - eg a lot of Hachioji, although the zoning is a bit different and that’s shaped the way they’ve emerged. It reminds be a bit of the way London has expanded - suburban areas centred on stations of train lines that were laid out in the 60s, with low-rise houses that are larger with modest outdoor areas. Tokyo proper is also smaller than the Tokyo conurbation that includes parts of Kanagawa, Chiba and Saitama prefectures, where the density really starts to fall off and give way to agriculture.