In 1995 season, he played many matches and won the champions J1 League.
However he could hardly play in the match and he moved to Segunda División club Racing Ferrol in 2002. he returned to Yokohama F. Marinos in 2003.
In April 1995, Yasunaga was selected Japan U-20 national team for 1995 World Youth Championship.
[1] In August 2016, Yasunaga became a manager for SC Sagamihara as Norihiro Satsukawa successor.
This biographical article related to a Japanese association football forward, born in the 1970s is a stub.