The Happy Sumo

 is a premium building released with the level 44 update. Building it unlocks Akira.

During the Black Friday 2015 Promotion the player got a refund (rebate) of 30 donuts when purchased.

On March 21, 2018 during The Springfield Jobs 2018 Event, it was a possible prize in the Asian Wonders Mystery Box.

About
The Happy Sumo is a Japanese restaurant located on Elm Street. Among the restaurant's menu offerings are all kinds of sushi, including fugu, which can be fatally poisonous if not properly prepared. The Master Sushi Chef is the only person at the restaurant qualified to prepare fugu. The restaurant also offers karaoke.

Regular
Akira Ralph Wiggum Sakatumi
 * Serve Questionably Prepared Fugu - 2h
 * Plant Bonsai - 12h
 * Prune Bonsai - 12h
 * Re-Pot Bonsai - 12h
 * Work a 24 Hour Shift - 24h
 * Prepare Sushi - 3h
 * Eat Away His Sadness - 60m

Quest Based
Ralph Wiggum Springfielders
 * Drop off a Resume - 10m
 * Eat Questionable Fugu - 60m
 * Eat Sushi - 2h