Aya is a freshman at Toudou Academy. She has a similar build to her sister and is close to equaling her in bust size. Since the first time they met, she has decided to become Souichiro Nagi’s wife because she believes it's fate; and it follows the tradition of the Natsume women. This attraction to Souichiro also leads to a rift between her and her sister, as Souichiro is in love with Maya. Though out the series, she has increased her skill and dedication so she can support Souichirou in anyway.

Та Ранмее е на 15 и е дъщеря на наркобос. Влюбена е в главния герой, които е пълен идиот, и иска да се омъжи за него. Появява се някъде към 15 чаптeр на мангата, в един кашон XD. Тя е доста ревнира и съответно агресивна към останалите момичета. Пряка съперничка на главната героиня Сеунгее Еум.

She is Minato's fourth Sekirei and her power is water (derived from her name "umi" which means the sea). She contacted him over a dream saying that she would kill him, but when they finally met she was persuaded into becoming his Sekirei. ( ch.22-23) She says that she is Minato's legal wife. At the beginning, she wanted to be the strongest to demonstrate that Ashikabi were not necessary to win but later she confides to Miya that her only goal is to get stronger to protect and live together with her Ashikabi forever.

Classmate and childhood friend of Takashi, they've known each other since kindergarten. When they were little she promised that one day she would marry him. Despite liking Takashi, their relationship was at odds at the beginning of the manga due to his indecisiveness. It was then that she started dating one of his friends, Hisashi, since he wouldn't make a move. As the story progressed they ended up reconciling their relationship. She doesn't find it above herself to reprimand Takashi for acting carelessly. She worries about his well-being yet admits that his selflessness nature is one reason why she fell in love with him. Headstrong and reliable, Rei has proven to be a skilled combatant and strong asset to the group.
Initially in the same year as Saeko, Rei was held back despite being an excellent student. Her father- a police detective- had been investigating the corruption behind the father of Shido, one of the teachers at her school. As a result of this he held her back purposefully. Rei bears a lasting grudge against him and feels uneven whenever he's around.
After having escaped the high school and resting at the family mansion of Saya, she and the group are in search of their parents.