This is an essay by the Japanese hematologist who is an international member of American society of hematology and now works in Japan. The kindle edition of "Byouki nannte yattsukero" has already been published by Amazon co. jp (https: //www.amazon.co.jp/dp/B00IGUT6GK). Many issues of "Byokinannte yattsukero" have been downloaded since its publication. Because there are also many requests for paperback edition, the author has published this book through createspace com. This essay is written in Japanese.