Takumi Nagayasu disovered the work of Tetsuya Chiba at a very young age. Impressed by its dynamics, he left for Tokyo to start a career in comics. In 1964 he became the assistant of Kenji Namba. While being his Namba's assistant, he drew his first own comic, 'Ofukuro' in 1968. Nagayasu remained in the shadows of his master for many years, until he met Katsuhiro Otomo, who wrote a scenario for him. Together they made 'Mother Sarah', which appeared in 1988. This comic, about a mother searching for her children in a postnuclear world, was published in several other countries. He is also the co-author, with Jiro Asada, of 'Poppoya', a serial about a lonely stationmaster.