Tamaki Anzai


 * This article contains major plot spoilers from the manga that have not been revealed in the anime. Proceed at your own risk.

Tamaki Anzai (安斎 環) is the father of Yuuki Anzai whom he had with his human wife, Midori Anzai. He is a devil convicted of the mass murder of 15 people, and is said to be the most dangerous devil in written history. Although he received the death penalty, he is being held in isolation at the ONL facility for research purposes.

Pre-ONL
Tamaki studied architecture in university and fell in love with a human girl named Miho Kaneda who shared the same major. While they were deeply in love, she was gang-raped by 5 men while she was walking alone one night. Struck with depression, she took her own life. The 5 men were convicted and sentenced to 6 years in jail. They got out after 5 years and when they did, Tamaki plotted to kill them all out of revenge. However, after he killed them, he had already lost control, and in a rampage, he killed 10 other innocent people including bystanders and the family members of the 5 men. Soon after, he was convicted of mass murder and sentenced to death.

Post-ONL
Drinking the blood of 15 people causes Tamaki to develop a strong dependence on blood. Since ONL was doing research on that subject, they secretly brought him in as a research subject, and he was able to avoid the death penalty. Tamaki never got over the death of his love and even after the scientists and researchers there had stabilized his condition, he refused to talk to anyone and spent his days mourning in his cell. Even though he needed it, drinking blood brought back especially bad memories, like when saw Miho's corpse and vision when he killed those people in his rampage.

It wasn't until Midori Sako started doing the Dialogue Sessions did he start to open up. Tamaki couldn't (and still can't) talk, but he was able to use a whiteboard to write his responses to her. The first thing he wrote was an answer to what he ate for breakfast. The two grew close over their sessions together. They even learned Japanese Sign Language together to make talking easier. Midori later gave him supplies for him to create a scale model house. Tamaki used those materials to create a dream house that he planned to make for his past lover. Thanks to Midori, Tamaki was finally able to get over everything.

One day, Midori came to Tamaki and explained that he would be participating in the 15th Hybrid Birth Project, to which Tamaki quickly agreed to because he owed his life to the facility. Initially, a woman named Ibuki Takeya was supposed to be a mother, but when Midori asked how he would react if she would be the mother, it took him by surprise. The worry ended up giving him a fever and Midori came to see him in the hospital where she apologized for her blunt question and explained the project further. She informs him that it will be artificial insemination, which is a great relief to Tamaki who thought having sex would be impossible with a human. However, Tamaki also made it clear that he wanted Midori to be the mother, in which they both confessed their feelings to each other. Since they realized that they wanted to have a child together, the Hybrid Plan was the perfect opportunity. They then got the permission to use Midori's eggs and Tamaki's sperm instead. However, Midori wasn't allowed to carry the child since she was a very talented researcher, ONL couldn't afford to lose her since being pregnant with children who have devil blood could cause problems. Because of that, Ibuki happily accepted to become the surrogate for their child. Thus, their son; Yuuki Anzai, was born. There were a lot of people involved with his birth, and due to the reason that Yuuki was a part of the Hybrid Project, ONLO received full custody of him and had to monitor him, so Tamaki and Midori never gained a legal parent-child relationship with him. Despite that, Tamaki always held a deep love for his son.

Since Midori's and Tamaki's love was mutual, despite the difficulties, they looked for a way to live together, in their own way, may it be Midori carrying a gun and tranquilizers with her, using handcuffs or not being alone together. Because of their dedication, Midori and Tamaki eventually got married.

Appearance
Tamaki is noted being very similar to his son Yuuki in terms of appearance, except for his hair which is light-colored and wavy since he is one-quarter English.

Due to his heavy dependence on blood, Tamaki is perpetually stuck in his transformed state. His nails on his fingers and toes are long and claw-like. His teeth protrude greatly from his mouth and impede his speech to the point that he rarely talks and if he does, it is done quietly and in small words. The only thing that remains normal are his eyes, although these can turn red under the right circumstances.

It also seems that Tamaki has scarred himself with his claws. The scars can be seen on his cheeks and his left shoulder. There is also a large scar on his neck.

He is often seen wearing nail protectors on his fingers and toes as well as handcuffs and a mask over his mouth.

Midori Anzai
Midori is Tamaki's wife, they have been married for over twenty years and share a very close bond. According to Midori, they are as "lovey-dovey" now as they were 20 years ago. In the past, Tamaki developed a very close bond with Midori, being very comfortable in her presence. She was the only one who was able to communicate with him and she was also the one who helped him ease his depression and accept his love's death, resulting in him becoming a much more sociable and communicative person. Tamaki was very grateful for this and came to care for her deeply, worrying about her whenever something happened and he would also comfort her when she felt down. After being informed about the Hybrid Plan, it ended up giving Tamaki a fever because he was scared of the idea of hurting Midori during the act. He then confessed to Midori by saying that he would rather her than anyone else to be the mother of his child in the project. He also appeared to be very flustered and embarrassed in Midori's presence whenever she got too close. Although he liked her, he was surprised and self-conscious of himself and that she liked her as he was sure that she could have anyone she wanted, but Midori reassures him that he is the only one she wants to be with. After having a child together, despite not having custody of their son Yuuki, their relationship became even stronger despite the major difficulties, they married and would report their daily schedules to each other. They are a very loving couple and Tamaki wants her to be safe when he isn't there with her. He loves her deeply and wishes that someday, they will be able to be more physically intimate with each other. Tamaki wishes deeply to hug his beloved wife someday.

Yuuki Anzai
Although Tamaki has never shared a relationship with Yuuki, he loves him deeply. He is ashamed of his past action which is why he absolutely doesn't want Yuuki to found about it, so when Kirio Kikuhara explained it Yuuki, Tamaki was seen to be absolutely devastated and enraged. Tamaki cares for Yuuki's well-being very much and wishes that he could both hug him and Midori one day.