Mezue ahịrịokwu na-esonụ: Yashima nwetara ihe nrite mbụ ya na mba ụwa na 1994 World Junior Championships na Athletics, ebe o tinyere nke atọ na ụmụ nwanyị 1500 mita n'azụ Anita Weyermann na Marta Domínguez. Ọ banyere n'ọkwa ndị okenye n'afọ na-esote ma duru ndị otu Japan gaa mmeri na 1995 Asian Cross Country Championships, ebe Yashima na ndị otu ya Michiko Shimizu na Yasuko Kimura na-ekpochapụ ebe ikpo okwu na ihe omume ahụ na mpaghara ụlọ na Chiba. Ihe a o mere mere ka a họpụta ya maka ihe nrite
1995 IAAF World Cross Country Championships, ebe ọ kwụsịrị 69th n'ozuzu.