A retired samurai must redeem himself for a crime that he committed earlier in his life.

A brother and sister learn their biological grandfather was a kamikaze pilot who died during World War II. During their research into his life, they get conflicting accounts from his former comrades about his character and how he joined his squadron.

Upon receiving a message from an old friend’s daughter, Goro arrives in Paris and learns of the elderly man’s wish to taste a particular soup he had in his childhood before he dies. Deciding to help, Goro sets out on a quest to find this mysterious soup, traveling through Japan, braving a storm, and even ending up in South Korea.

Mari and Humi learn from their mother that their father has dementia on his 70th birthday. They help prepare their mother for his farewell and prepare themselves for the emotions to follow.