Thank you! Yes they're so versatile, it's amazing! The weight capacity means the bikes are generally built tough too, which is just as well considering how much we put them through!
Oh wow, that's a bit out of my wheelhouse! I'd love to be able to help, but I don't know of any distributors for cargo bikes in Tokyo. I did see this Instagram post from Larry Vs Harry not too long ago, perhaps you could reach out to them and ask if they know of any cargo bike shops in Tokyo? instagram.com/p/C0OIYAZRB-j/?hl=en