Yashima akagamuchira menduru yake yekutanga yepasi rose pa1994 World Junior Championships muAthletics, kwaakaisa wechitatu mumamita 1500 evakadzi padhuze naAnita Weyermann naMarta Domínguez. Akapinda mumakwikwi makuru gore rakatevera uye akatungamira timu yeJapan kukunda mu1995 Asian Cross Country Championships, naYashima nevamwe vake vechikwata Michiko Shimizu naYasuko Kimura vachipukuta podium pachiitiko ichi kumba turf kuChiba. Izvi zvakamuita kuti asarudzirwe 1995 IAAF World Cross Country Championships
, kwaakapedza ari wechi 69.