Tamaki Anzai

Tamaki Anzai 「安斎環」is the father of Yuuki Anzai. He is a devil convicted of the mass murder of 15 people. Although he received the death penalty, it seems he is being held in isolation at the ONL facility for research purposes.

Appearance
Tamaki is described as looking just like Yuuki except for his hair which is light and wavy because 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.

Pre-ONL
Tamaki studied architecture in university and fell in love with a human girl 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 cause Tamaki to develop a strong dependence on blood. Because 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 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.

It wasn't until Midori Sako started doing the Dialogue Sessions did he start to open up. Tamaki can't talk, but he was able to use a white board 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 to materials to create his and his love's dream home.

Then, one day Midori came to him asking him to be a part of the 15th Hybrid Birth Project. He accepted quickly because he owed his life to the facility, but when Midori says she would be the mother, it takes him by surprise. The worry ends up giving him a fever and Midori comes to see him in the hospital where she apologizes and explains the project further. They share their feeling for each other. She then 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.