Midori Anzai

Midori Anzai (安斎 みどり) is the human mother of Yuuki Anzai whom she had with her devil lover, Tamaki Anzai. She works at ONL as a devil researcher in which she goes under her maiden name Midori Sako (佐古 みどり).

History
Several years before the start of series, Midori Sako (which she was called at the time) worked a devil researcher affiliated with the ONL. Midori met Tamaki Anzai who had been held in isolation for his mass murder. Midori states that, from the first time they met, she was concerned for him; and as she continued to meet with him, she fell in love with Tamaki. They became closer, and Tamaki finally opened his heart to Midori after so long since his murder. Since their love was mutual, 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. Even though it had its hardships, they endured.

And one day, Midori came to Tamaki asking him to be a part of the 15th Hybrid Birth Project, to which he accepted quickly because he owed his life to the facility. She informed him that she would be the mother and that it would be artificial insemination, which was a great relief to Tamaki who thought having sexual intercourse would be impossible with a human. Thus, their son; Yuuki Anzai, was born. There were a lot of people involved with his birth, and due to some reasons, Midori never gained a legal parent-child relationship with her son, but Midori still looked over him at the ONLO orphanage from a distance and continued with her research about devils and their co-existence with humans.

Appearance
Midori is a middle-aged though youthful-looking woman with a slim build who is described as beautiful. She has dark hair (presumably black) which is wavy and falls down to her shoulders with her bangs parting in the middle and framing her face. She has two moles on her face; one under her eye and another one on her cheek. Yuuki is also noted to be very similar to his mother, as he inherited her beauty, moles and black hair.