|Relatives|| Shuichiro Keido (Brother)|
Kurosu Ouma (Husband)
Shu Ouma (Stepson)
Mana Ouma (Stepdaughter)
|Occupation||Senior Researcher of Sephirah Genomics|
|Anime debut||Episode 1|
|Japanese voice||Chika Fujimura|
|German voice||Gisa Bergmann|
Haruka Ouma is the Senior Researcher of Sephirah Genomics, (which is apparently within the "GHQ") which was in charge of creating a cure for the Virus and is Shu's step-mother.
She is usually seen wearing a lab coat at work. But at home, she is always in her underwear even in front of guests. After Episode 12, she wears a tight blue uniform. She is young with brown hair.
She graduated high school a year early and became Kurosu Ouma assistant, usually cooking for him, and covering him, when he fell asleep. She saw him as a hero willing to sacrifice himself, to stop the Apocalypse Virus and fell in love. A year later, she was his new wife and she quickly moved Shu, Mana and Gai to Tokyo. On Lost Christmas, she and Mana waited in a church for a family gathering. Mana told her to get Kurosu, as most likely he was too absorbed in his work to realize the time. When she arrived at Kurso's lab, she found him dead, and then Lost Christmas occurred. In the end, despite not knowing Shu at all, she raised him out of love. But she always wondered, if they had a real relationship as mother and child.
She seems to have two sides of her personality, a serious side and a playful side. At work she is very professional, and usually stays at work for most of the week. At home she only wears her sleepwear, which includes her bra, her panties and a nightgown, even around company. She is willing to answer the door in her sleepwear, and is very playful with Shu. But she is very protective of Shu saying she must protect his future, even willing to have Shu's arm get cut off in order to save him from the king's power. Despite pretty much abandoning Shu, she does love him dearly, and started crying when regained his powers.
She is seen watching the bright light that shot up through the sky, which was a result of Shu's newly awakened power. However, it is not shown that she knew it was her son who caused that light. She is seen again in a meeting with some of the GHQ members as they talk about defective drug that was developed accidentally during the creation of the Apocalypse Virus vaccine.
She helps Shuichiro's plot to remove Shu's Power of Kings in order to make free him from the "fate of the king". She spoke to Segai Waltz about herself, describing to him that her motherly love was a harsh sort.
It was revealed in episode 19 that Shu and Mana are her stepchildren from their father and in episode 20 that Shuichiro Keido is her older brother.