A convivial atmosphere (though it's fine to sit at the counter solo), walls decorated with sake labels, and an enormous drinks menu – just what you want from a local izakaya. There are numerous sakes from Okayama Prefecture and beers from local microbreweries. Try the Doppo pilsner or a Kibi Doteshita Bakushu ale.
From Sunday to Thursday, a set sushi menu with all-you-can-drink sake (in two hours) is available for ¥3000 – challenge accepted. Izayoi is just off the Sky Mall arcade. Look for the sign written across a yellow moon.