I whanau a Ekuan i Tokyo i te Mahuru 11, 1929, i noho ia i tana tamarikitanga i Hawaii. I te mutunga o te Pakanga Tuarua o te Ao, ka neke ia ki Hiroshima, i reira ia i kite ai i te pupuhi karihi o te taone nui, i mate ai tana tuahine me tana papa, he tohunga Buddhist. I kii ia ko te whakangaromanga i akiaki ia ki te noho hei "kaihoahoa mea". I muri mai ka haere ia ki te Whare Wananga o Tokyo National o nga Toi Toi me te Waiata (i tenei ra ko te Whare Wananga o Tokyo o nga Toi). I te 1957, i whakatuhia e ia te GK Industrial Design Laboratory (GKインダストリアルデザイン研究所). "GK" i tu mo te "Group of Koike", na te mea ko Koike te ingoa o te kaiwhakaako honohono i te whare wananga. I te tau 1970, ka noho ia hei perehitini o te Japan Industrial Designers 'Association, a e rima tau i muri mai ka tohua ia hei perehitini o te International Council of Industrial Design. I te mutunga o tona oranga, i noho ia hei tumuaki
Ko Hawaiki