Chiho Futaba

Chiho Futaba (双葉 千帆) is a character featured in The Book: 4th Another Day, based on Diamond Is Unbreakable.

History
Chiho Futaba was a child who saw her parents fighting many times. As she couldn't concentrate on reading over the sound of her mother breaking dishes, she ran away from home when she was 12 year old. She decided to take a bus to S City, but gave up after realizing she lived her entire life in Morioh.

One day, Chiho was attacked by a delinquent when alone, but was saved by a mysterious boy and returned home.

Along the years all her friends stopped talking to her to be with boys, while her best friend moved to an all-girls high school in S City to become an interpreter for Hollywood stars. Chiho decided to write a diary and ended up spending hours writing in it. After seeing it was written more like a novel, Chiho decided to become a writer. She lives with her father Teruhiko Futaba now in Morioh, and is spoiled by him. Yukako was apparently her old neighbor.

The Book: 4th Another Day
In 2000, Chiho is an aspiring novelist. Fascinated with rumors from Morioh which could give her ideas for her novels, she researches about the iron tower man and later the bizarre book.

One day, Chiho meets Takuma Hasumi and becomes his friend, believing him to be the boy who saved her from her aggressor years ago even though Takuma denies it. During that time, she frequents Takuma regularly, bonding over their mutual love for literature. Several months later, Chiho falls in love with Takuma, and finally knows it is Takuma who saved her before. On one occasion she has sex with Takuma and ends up getting pregnant.

Two months after they became a couple, Chiho invites Takuma to her home for dinner, and later receives a black amber necklace from Takuma, which is exactly the one her father Teruhiko gave Takuma's mother, Akari years ago. From his father's words, Chiho probably learns that she's actually Takuma's half-sister. The details of this night are unsure, but it is implied that she stabbed her father to death, then set her house on fire. Chiho is later is taken over by her mother who lives far away from Morioh after Takuma dies.

The last time she is publicly seen, in August 2000, Chiho meets Koichi Hirose and talks with him a little while and reveals her pregnancy, intending to give birth to Takuma's child. Chiho then leaves Morioh in a bus.