Rubuta ci gaba don wannan sakin layi - An haife shi a garin Ojiya a lardin Niigata, Isa ya sami biathlon bayan kammala karatun 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 kuma dukkan 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.