In July 2012, Inui signed a three-year contract with newly promoted Bundesliga club Eintracht Frankfurt after impressive performance in the 2.

[5] On 26 August 2015, Inui was transferred to La Liga side SD Eibar for a then club record fees of € 300,000, after agreeing to a three-year contract.

[10] On 1 June 2018, upon expiration of his Eibar contract, Inui joined Real Betis on a free transfer for a three-year deal.

[15] On 27 October 2024, Inui was brought his club secure promotion to J1 League from next season after win at away game against Tochigi SC 1-2 in matchweek 36.

Seven days later at same year, Inui was brought his club secure champions of J2 in 2024 season after defeat Iwaki FC with narrowly score 1-0 in matchweek 37.

[17] On 24 June, Inui scored his first World Cup goal in a 2–2 draw over Senegal during their second group stage match of the tournament.