On 13 January 2023, Hamano signed for Chelsea and was immediately loaned to Swedish side Hammarby IF.[3][4] There, she made 17 league appearances and scored 7 goals during the 2023 Damallsvenskan season,[1] before being recalled in September after sustaining a shoulder injury.[5]
In July 2022, Hamano was included in the Japan under-20 team for the 2022 U-20 World Cup,[7] where they finished as runners-up after losing to Spain in the final. She won the Golden Ball as the tournament's best player, and the Silver Boot as the second-best goalscorer behind Inma Gabarro.[8]
Hamano made her senior team debut on 6 October 2022, when she came on as a substitute for Mina Tanaka in the 69th minute of a 2–0 friendly win over Nigeria.[9][10] On 13 June 2023, she was included in Japan's 23-player squad for the 2023 World Cup.[11]