[1] Aihara suffered from consistent injuries during his time at Consadole Sapporo U18s.
[2] On 13 December 2018, Aihara was announced as a 2019 season signing for FC Gifu, joining from Kindai University.
[4] On 4 December 2021, the club decided not to renew Aihara's contract.
[6] He made his league debut against Renofa Yamaguchi on 20 February 2022.
[9] He made his league debut against Fukushima United on 24 February 2024.