There's a huge misconception around density and the paths that North American cities take to achieve it. The ideal should be large mixed-use neighbourhoods with medium density. There are plenty of neighbourhoods like that in the inner-city suburbs surrounding Tokyo city centre, for example.
Hatagaya contains detached homes, townhouses, condos, and SROs all in abundance with restaurants, shops, parks, and businesses.
https://en.wikipedia.org/wiki/Hatagaya,_Shibuya