On 8 May 2015, Hasegawa was promoted to the first team as a type-2 player.[4] On 18 May 2016, he made his debut in the J.League Cup against Kashiwa Reysol.[5][6] On 22 November 2016, Hasegawa was promoted to the first team from the 2017 season.[7]
On 12 January 2021, Hasegawa returned to Albirex Niigata.[8] On 5 February 2021, he suffered an ACL injury during a training session and would be out for 8 months.[9] On 6 January 2022, Hasegawa's contract was extended for the 2022 season.[10] On 7 January 2023, his contract was extended for the 2023 season.[11] On 30 December 2023, Hasegawa's contract was extended for the 2024 season.[12] On 15 May 2024, he suffered an injury that would keep him out for 4 weeks.[13]
Loan to ThespaKusatsu Gunma
On 4 July 2018, Hasegawa joined Thespa Gunma on loan until 31 January 2019.[14] He made his league debut against FC Tokyo II on 25 August 2018.[15]
Loan to Zweigen Kanazawa
On 26 December 2018, Hasegawa's loan contract with Thespa expired, and he was loaned to Zweigen Kanazawa until 31 January 2020.[16] He made his league debut against Tokyo Verdy on 9 March 2019.[17] On 11 September 2019, Hasegawa suffered an ACL injury and would be out for 8 months.[18] On 27 December 2019, his loan contract was extended until 31 January 2021.[19] Hasegawa scored his first league goal against Thespa Gunma on 26 July 2020, scoring in the 73rd minute.[20]