 On 21 May 2017, Inui became the first Japanese footballer to score against FC Barcelona, sniping the ball via cross-bar behind Ter Stegen, twice.On 1 June 2018, upon expiration of his Eibar contract, Inui joined Real Betis on a free transfer for a three-year deal.He made his debut for Betis on August 17 2018, coming on as a substitute for William Carvalho for the last 25 minutes in 3–0 loss against Levante.