Kammala wannan jumla: An haife shi a garin Ojiya a lardin Niigata, Isa ya sami biathlon bayan ya kammala makarantar sakandare kuma ya shiga soja. Isa ya fara halartar gasar cin kofin duniya a zagaye na farko na gasar cin kofin duniya ta 2000<unk>01 a Antholz-Anterselva, Italiya. A wannan kakar Isa ya fara halartar Gasar Cin Kofin Duniya a Gasar Cin Kofin Duniya a Pokljuka. Ya kuma halarci dukkan Gasar Cin Kofin Duniya daga 2003 zuwa
2009, sannan duk Gasar Cin Kofin Duniya uku daga 2011 zuwa 2013 don Japan. Isa ya halarci wasannin Olympics na farko a 2002 kuma ya kuma halarci wasannin Olympics a 2006, 2010 da 2014. Kyakkyawan sa na mutum a wasannin Olympics ya zo ne a tseren kilomita 12.5 a 2006, ya gama na 35. Kyakkyawan sa na ƙarshe ya zo ne a shekara ta 2006, a matsayin na 12. Mafi kyawun sa na mutum a Gasar Cin Kofin Duniya ya zo ne a shekarar 2005 a Hochfilzen, inda Isa ya gama na 25 a cikin bin sawu. Matsayi mafi kyau a gasar zakarun duniya shi ne na 11 wanda ya zo a 2001 a Pokljuka.