Takuma Hasumi

Takuma Hasumi (蓮見 琢馬) is an antagonist featured in the The Book: 4th Another Day novel, based on Diamond Is Unbreakable.

Appearance/Personality
Takuma is a teenage male with a slender build and a horse-shaped birthmark on his neck. He has the natural ability to memorize everything he sees, hears or senses at all times, including the smallest details. Forced to remember things he wants to forget, such as the pain of getting hit by a car, Takuma has produced permanent red marks on his arms from scratching them so hard. He had no control over his memories until he developed his Stand, The Book.

To hide his arms, Takuma only wears long-sleeved jackets (mostly school uniform jackets) and refuses to take them off. He is also always seen with a pen, given to him by the Crybaby Boy, his friend in the orphanage. Takuma has chosen to live a reclusive life, in order to avoid collecting more data. He is usually described as being "a void without emotions". However, it is revealed from the past story of Takuma's friendship with Crybaby that Takuma is deep down kind and considerate. This can also be proofed by Takuma saving Chiho from a delinquent when he was 13, unaware of Chiho is Teruhiko's daughter.

History
Takuma is the son of Akari Hirai and Teruhiko Okami. After Akari gave birth to him, Teruhiko abandoned him in a temple according to their deal. Takuma was then taken to an orphanage and got this name from the orphanage dean, inspired by his horse-shaped birthmark. Later, the orphanage staff found out about his natural ability to not forget anything and thought he was a genius, but were disappointed when they realized he could only store data, but not actually put them together to solve problems.

Takuma was once involved in a traffic accident when he was in grade 2. He was recalling a classic music he heard on music class, and found that music so familiar but had no clue. During his concentrating, Takuma accidentally walked down to the road and got severely hit by a car. Though saved after a few days of coma, the crash left a scar on his right thigh root.

It turns out his ability made his life much worse, as he could never forget anything in his head, even those unpalatable scenes and experiences. Overwhelmed by the limitless memories and the horribly actual feelings, Takuma excluded himself in a single room in the orphanage and cut off all communication. Yet the memories still didn't stop emerging, Takuma started to hurt himself, mainly scratching his arms strongly. He even tried suicide for multiple times, including stabbing the veins in his wrists with a scissor, jumping down the building, but never succeeded. During his hospitalization, he developed his Stand, The Book, and the memories once stored in his head were all transferred in the Stand, so his long pain was finally solved. He soon recovered and returned to the orphanage, but still lived in the single room in case something happened again. Later, he found nobody could see The Book except himself, and he could remember anything in his life anytime he wanted just by looking at the pages of it.

By reading the distant past of himself from The Book, with the hint of that classical music and his annual nightmares, Takuma got to know Akari, who gave birth to him in a dingy place and dedicated her utmost to him for only 3 days (when that classical music played and left impression on Takuma). Then a man came along with a woman, took him away and dropped him in a temple. The Book recorded the whole process including their conversation. From this information, he ascertained Teruhiko and Hanae, and understood what happened between them and Akari. To verify this, Takuma made his way to the building gap in which Akari was trapped, and found Akari's corpse there. Takuma regathered Akari's scattered bones and hair, Akari's necklace, and all stuff Akari kept there, including the picture with a horse on a grassland, which was decorated in Takuma's room later. After knowing that Akari died due to Teruhiko, Takuma vowed revenge.

Takuma started to practice throwing knives when he was in grade 12. With the help of The Book, he soon mastered this skill no matter what kinds of knives he used. When Takuma was 13, on a winter night, he encountered the 12-year-old Chiho Futaba, getting entangled by a delinquent on her way of home leaving. Takuma then used a knife to cut down one of the delinquent's ears, saved Chiho and left. From then on, Takuma continued his reclusive life, remaining unfamiliar to anyone, but having a plan of his revenge.

After Takuma graduated from middle school, he moved into a house where a suicide case happened before. It is revealed later in the story that Takuma still keeps contact with the orphanage and occasionally goes there to help the work, probably implying Takuma's living is supported by the orphanage. Also, the fact that he knows where Akari's home is and Akari's parents implies that Takuma did investigation about Akari based on his memory in The Book.

The Book: 4th Another Day
When Takuma gets to know that his father's former lover Hanae Orikasa is searching for him, he made his first move, goes to Hanae's house, shows her his identity and kills her with his car crash memory from his Stand, so her death would reach Teruhiko's ears. He then meets Chiho at Thorn Parlor, a local public library Takuma likes to go, and develops a friendship with her, who is unaware that she's actually Takuma's half-sister. Believing Hanae's death to be the work of a Stand user, Rohan Kishibe and Koichi Hirose start an investigation on the death of Hanae, which is later accidentally known by Takuma. When Takuma passes by Koichi along with Josuke Higashikata and Okuyasu Nijimura in the school, Okuyasu unintentionally steps on his pen and breaks it, which is received from Crybaby as a gift when Crybaby gets adopted and leaves. Josuke then uses Crazy Diamond to repair the pen, being seen by Takuma's eyes and causing Takuma's vigilance to them.

When Takuma secretly observes Josuke and his fellows, he realizes they are in pursuit of a student with scratch on the arms. To confuse them, Takuma uses The Book to implant his memory of strongly scratching his arms to multiple male students in the high school, causing the actual damage on their arms. At a day when Takuma is walking with Chiho, he is stopped by Josuke sitting near a pool in front of the train station, for asking time. When Takuma is watching on his watch, Josuke uses Crazy Diamond to loosen the watchband with a pin and make it drop into the pool, forcing Takuma to pick it up with his sleeve rolled up so that he can check Takuma's arms. Understanding Josuke's intention, Takuma picks up his watch without rolling up his sleeve, causing Josuke's suspicions. The small interrogation ends up with Okuyasu running to Josuke and telling him the discovery of several students with scratch on their arms.

Regarding the investigation of Josuke and his fellows as an obstruct, Takuma decides to kill Josuke. He tears down one page from the forbidden area of The Book, recording his painful memories during his childhood, such as suicide commitment, car crash (which is the one Takuma used to kill Hanae Orisaka), and influenza. Planning to use the page recording his wrist-cutting suicide memory to kill Josuke, he seals the page in an envelope and directly sends the letter to Josuke's home. However, Takuma's plan unexpectedly fails because Josuke's mother, Tomoko Higashikata is the one checking the letter and reading the page. Though Tomoko's life is safe thanks to Josuke's immediate rescue, what Takuma's done has seized Josuke's attention and made his mind to catch the culprit.

As time goes by, Takuma and Chiho start a relationship, based on Chiho's growing affection to Takuma and her discovery of the truth that Takuma is actually the teenager who saved her from a delinquent with a knife during her home-leaving. Later, Takuma is invited to Chiho's home for dinner, getting the chance to confront his father, Teruhiko Futaba. Though surprised at finding out Teruhiko can also see The Book, Takuma manages to show his tracking research of Teruhiko's social circle, Teruhiko's illegal commitments, and his idea of marrying Chiho to Teruhiko, making him panic. After that, on the way of Chiho sending Takuma off, she receives a black amber necklace from Takuma, which is the one Teruhiko gave Akari, and Takuma gained from the building gap while searching for Akari's corpse. The necklace gives the final hint about Takuma's identity to Teruhiko, arising an enormous despair to Teruhiko. Right at this point, Takuma's revenge is considered as completed, for his true purpose is not killing Teruhiko, but making Teruhiko live the rest of his life in deep regret.

Takuma plans to leave Morioh Town, for he has achieved his goal here. Before he sets off, he wants to finish Chiho's manuscript at Thorn Parlor. However, Okuyasu finds Takuma and tries defeating him. Even though Takuma manages to defeat Okuyasu using his influenza memory, he is later chased by Josuke to the roof. During their fight, Takuma is being overpowered. Takuma finds out that Josuke was saved by an student with a pompadour in his past and tries to use it against him, but this just upsets Josuke more. While Takuma is able to heavily injure Josuke, he is eventually defeated by him, ending up falling from the building to his own death wish. After this happens, the orphanage claims Takuma's body from the police and holds his funeral at the temple where he was initially found. It is revealed Chiho is pregnant with his child.