After graduating from high school, he joined his local club JEF United Ichihara in 1994.
However he could hardly play in the match and he moved to Japan Football League club Kawasaki Frontale in 1997.
In April 1995, Otsuka was selected Japan U-20 national team for 1995 World Youth Championship.
In July 2024, Otsuka was named manager of J2 League club Ventforet Kofu following the dismissal of Yoshiyuki Shinoda.
This biographical article related to a Japanese association football midfielder born in the 1970s is a stub.