Tokiko’s mother died 20 years ago and her father Tetsuya is now in his 70's. Her father has a free spirit and is cute. Tokiko is in her mid 40's and still single. She has a strong personality. In their past, Tokiko and Tetsuya did not have a good relationship. It got so bad that they almost ended their relationship, but now they occasionally meet. They go out to eat together and have conversations.
Tokiko decides to publish an essay about her father Tetsuya. To collect information for her essay, she meets Tetsuya and listens to various stories, but it's not just pleasant memories.
A psychological drama that explores the dilemma of whether a person who has had integral parts of them changed, fundamentally remain the same person.
Naruse Junichi hopes to one day become a painter, but he works currently on a factory line. His girlfriend is Megumi and his days are generally happy. On Christmas Eve, Junichi stops by a jewelry store to buy an engagement ring. He then becomes a part of a robbery at the jewelry and he suffers a head injury. Junichi becomes the first successful brain transplant patient in the world.
Junichi is unaware that he received a brain transplant. When he is discharged from the hospital, Junichi's hearing becomes sensitive and he also becomes violent. He does not hold the same feelings for his girlfriend, Megumi. Junichi realizes he is changing and becomes seized with horror. Meanwhile, Megumi hopes Junich becomes his old self. She also seeks to unlock the hidden mystery of Junichi's operation.
Adapted from the novel "Henshin" by Keigo Higashino.
