A ƙarshen Yaƙin Duniya na II, ya koma Hiroshima, inda ya shaida harin bam na atomatik na birni, wanda ya rasa 'yar'uwarsa da mahaifinsa, wani firist Buddha. Ya ce lalacewar ta motsa shi ya zama "mai ƙirƙirar abubuwa". Daga baya ya halarci Jami'ar Tokyo ta Fine Arts da Music (a halin yanzu Jami'ar Arts ta Tokyo). A shekara ta 1957, ya kafa GK Industrial Design Laboratory (GKインダストリアルデザイン研究所). "GK" ya tsaya ga "Group of Koike", kamar yadda Koike ya kasance sunan farfesa a jami'ar. A shekara ta 1970, ya zama shugaban kungiyar masu zane-zane na masana'antu na Japan kuma bayan shekaru biyar aka zabe shi a matsayin shugaban kungiyar International Council of Industrial Design. A lokacin rayuwarsa, ya yi aiki a matsayin shugaban Cibiyar Zane-zane ta Art Institute, shi ne shugaban makarantar zane-zane da zane-zane na Jami'ar Tokyo.
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