Sequelae of nuclear explosion. Having experienced the great events in life like marriage and having children, Hirayama Ikuo had a turning point in his painting. During this period, he experienced the symptom of excessive fatigue, and sometimes even a short blackout. After diagnosis, the doctor said he only had as half leukocyte as ordinary people which put him in dangerous situation.The reason is clear and it's the sequela of a nuclear explosion. In May 1959, Hirayama led the students to the customary Northeast sketch tour. The whole journey started from Towadako, then climbed the Burning Hill through Oirase, and headed north to the Mount Hakkoda and finally arrtived at Tutaonsen. Although he felt the heart beat rise and dizzy from time to time on the way, he followed his students and finally completed the journey.