Yokohama, 1963. Japan is picking itself up from the devastation of World War II and preparing to host the 1964 Olympics—and the mood is one of both optimism and conflict as the young generation struggles to throw off the shackles of a troubled past. Against this backdrop of hope and change, a friendship begins to blossom between high school students Umi and Shun—but a buried secret from their past emerges to cast a shadow on the future and pull them apart.
Popular, outgoing Fujino is celebrated by her classmates for her funny comics in the class newspaper. One day, her teacher asks her to share the space with Kyomoto, a truant recluse whose beautiful artwork sparks a competitive fervor in Fujino. What starts as jealousy transforms when Fujino realizes their shared passion for drawing.
A humble and simple Takezo abandons his life as a knight errant. He's sought as a teacher and vassal by Shogun, Japan's most powerful clan leader. He's also challenged to fight by the supremely confident and skillful Sasaki Kojiro. Takezo agrees to fight Kojiro in a year's time but rejects Shogun's patronage, choosing instead to live on the edge of a village, raising vegetables. He's followed there by Otsu and later by Akemi, both in love with him. The year ends as Takezo assists the villagers against a band of brigands. He seeks Otsu's forgiveness and accepts her love, then sets off across the water to Ganryu Island for his final contest.
The world-famous woodblock artist Hokusai (1760-1849), a widower in need of a steady income, lives with his daughter Oei in the house of his friend Bakin.