[2] The metallic black and red exterior was chosen to complement each of Japan's seasons, with a "sleek, futuristic design [that] suggests speed".

Given the service life of an average train in the country from 30-50 years, the firm tried to avoid design trends and create something that would still be stylish over this extended period with "dignity and elegance".

Car interiors were designed with a sense of "upgraded relaxation" and excitement, as one would feel going to a resort.

The deep metallic red car exteriors were the result of much discussion with the paint manufacturer.

[2] The train type was awarded the Blue Ribbon Award by the Japan Railfan Club on May 26, 2021,[7] representing the best new train in Japan from the previous year.