Not only TOTO specialize in small bathroom layouts in Japan. INAX is another company who also makes small rooms where tub and shower are combined and the whole floor could soak water. The floor and the mirror both have built-in heating. Such bathrooms are easy to clean up and are perfect for those who live in houses. It’s hard to install such room in apartment so the product better suits to house owners. There are more than one line of such bathrooms by INAX. They differs in design, size, arrangement of things and built-in features. On INAX site you can read more about that.