The world-famous woodblock artist Hokusai is a widower who lacks the ability to earn money, and he lives with his daughter Oei at the house of his friend, Bakin. Hokusai meets a woman called Onao and finds himself uncontrollably attracted to her, but she disappears all of a sudden. One day, an excited Oei brings home a young girl who looks exactly like Onao. Immediately, Hokusai starts to paint, using the young girl as a model. The illusion of Onao drives Hokusai back into the waves of youth as he painted the masterpiece of the gigantic octopus and the beauty being seduced, at the age of 90.