[3] After his graduation from Ryutsu Keizai University in 2017, Ryo Germain joined J1 League club Vegalta Sendai as a Special Designated Player.
[7] After three seasons with the Tōhoku outfit, Germain joined J1 League club Yokohama FC in 2021.
[10] On 1 March 2024, Germain scores four goals against Kawasaki Frontale at Uvance Todoroki Stadium by Fujitsu and won 5-4 for his team in Matchweek 2 of 2024 J1 League.
On 25 December 2024, Germain was announce official permanent transfer to J1 club, Sanfrecce Hiroshima from 2025 season.
[14] Ryo Germain was born in Atsugi, Kanagawa to an American father and a Japanese mother.