Born in Japan, Seto trained between 2004 and 2005 with Brazilian teams
Avaí,
Corinthians, and
Portuguesa-RJ in order to improve his footballing skills. He also played
indoor football in his country of birth. Seto started out as a senior in 2007 with
Romanian third division club
Astra Ploiești; he spent most of his career at that side, which later relocated to
Giurgiu. Seto totalled 26 goals from 274 games in the
top flight and won four major honours with Astra, including the
2015–16 Liga I. He also had brief stints with clubs in Turkey, Japan, and Latvia, as well as with
rivals Petrolul Ploiești, respectively. In July 2024, aged 38, he joined
Argeș Pitești. ==Career statistics==