The agency has been called in after a three-way pitch to handle the in-house press office as part of the three-month project.
The team will be charged with engaging with the media about the YO! Sushi experience and building on the brand credentials as the first restaurant to make sushi accessible in the UK.
3 Monkeys associate director Tristan Pineiro will lead the account and the team will report to YO! Sushi senior marketing manager Mark McCulloch.
Separately, 3 Monkeys has also won an account with human resource and benefits consulting firm Buck Consultants to handle its corporate media relations.