We are looking for sake cups to buy for our visitors. We noticed most of the sake sets include a sake bottle with the same style as the cups. So we are wondering, how necessary is it to use that? Is it faux pax to pour directly from the bottle where the wine was originally bought from?
https://www.reddit.com/r/japan/comments/12fcsr1/we_are_serving_sake_in_the_office_with_japanese/