After a blank for 10 months, in October 1998, he joined his local club Kyoto Purple Sanga.
After retirement, Karashima started coaching career at Kashiwa Reysol in October 2001.
In 2005, he signed with Regional Leagues club Matsumoto Yamaga FC and became a manager.
In 2009, he moved to Regional Leagues club Japan Soccer College and became a coach.
In 2014, he moved to Japan Football League club Sagawa Printing Kyoto based in his local area.
This biographical article related to a Japanese association football defender born in the 1970s is a stub.