Kayo Hinazuki

Kayo Hinazuki is Satoru Fujinuma's primary school classmate and one of the victims of the serial kidnapping case 18 years ago. She was a loner due to her mysterious family life, which made her an easy target to kidnap. In an attempt to prevent her kidnapping, Satoru desperately tries to befriend her.

Personality
Kayo doesn't have much of a presence in class. Prior to becoming friends with Satoru's group, she didn't have any friends and didn't speak to anyone. She considered Satoru and herself as 'Fakes'. Kayo doesn't open up to many people because of her mother's abusive nature. She is extremely blunt and tends to call people idiots (mostly Satoru). Her greatest dream is to live on an island away from society especially away from her mother where she could do what she wanted, expressing a desire for freedom.

Due to her abusive childhood, she initially has a hard time trusting people. In addition, she is not used to people being kind to her or approaching her. When she stays over at Satoru's, she breaks down in tears at the delicious meal his mother prepared, as her own mother never cooked for her and gave her money or a piece of bread or instant ramen instead.

After she is taken into her grandmother's custody, she still shows signs of being antisocial, skipping out on club meetings to tend to Satoru until his mother moves him away to a different hospital. She grew a close relationship with Satoru's mother Sachiko, calling her her mother.

As an adult, she tells Satoru she managed to obtain happiness and is shown with a smile gently holding her child.

History
Kayo's mother, abused her quite a lot throughout her life. Many injuries included suffocation, bruises and other tortures. When Kayo first met Satoru during the 18 year "Revival" she asked Satoru to kill someone for her (meaning it as a' joke'), however, she had actually wanted him to kill her mother, out of her depression from the abuse her mother gave her.

Sometime in the future, she got married to Hiromi Sugita, becoming Kayo Sugita. They had a son together named Mirai who is said to have his father's eyelashes.

After Satoru wakes up, She visits him with her son. She reflects on her discomfort of leaving him behind and is chided by Satoru in turn.

Popular quotes
"Are you stupid? (JP: Baka na no?)"

"Everybody is fake, living in their fake lives."

- Kayo to Satoru

"Can you kill someone for my sake?"

- Kayo to Satoru

"When I get bigger, big enough to go somewhere by myself, I want to go to a land that’s far away. I want to go to a faraway island. I want to go to an island that has no people. I want to go to an island that has no pain or sadness. On that island, I can climb a tree when I want to climb, swim in the sea when I want to swim, and sleep when I want to sleep. When I think about the town without me, I feel a sense of relief.I want to go far, far away."

- Kayo's poem; The Town Without Me

Trivia

 * Kayo always use the phrase "Are you stupid?" when talking to Satoru. This phrase is also used by Airi Katagiri, which gives him a shock when he hears that, giving a hint that Airi is likely a reincarnation of Kayo for him.
 * In the manga version, Kayo is not transferred to a new school after the incident but in the anime version, she did. It creates a little confusion in the end as Kayo marries Hiromi which is has a slight chance to happen due to this.