Saint Liliana High School Second year student. Akiko is [Akito](https://anilist.co/character/54725)'s sister, and has a pretty appearance and polite manners. However, she has very serious brother-complex, and is taking a very active way to seduce Akito. She is also very proud of her brother complex and makes no effort of concealing it. She is the secretary of Saint Liliana High School Student Council, but is very reluctant when Akito interacts with other Student Council members.

~!She doesn't know that Akito has no blood relationship with her and believes that they are twins; according to their deceased mother, Akiko will probably sexually assault her brother once she learns this fact. As for now, believing that they are blood related siblings, and respecting her brother's will is the only barrier that stops her from doing so.!~

~!She is a fan of Kouichirou Shindo, and wishes her brother would be as aggressive as the brother in Kouichirou Shindo's novel; however she hasn't notice that Kouichirou Shindo is her brother, and the beginning of Kouichirou Shindo's novel is based on their relationship.!~

Akiko is thrilled to be reuniting with Akito, the handsome older brother she hasn’t seen in years! In fact, she might be a little too excited. This pint-sized cutie has a big brother complex, and she’s not interested in sharing his attention. Unfortunately for little sister, she and Akito won’t be living alone: three gorgeous girls from the student council will be along for the ride! <br><br>
(Source: Crunchyroll) 


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Short specials included in the Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne Blu-rays and DVDs.

The story is about the Himenokouji twins named Akito and Akiko who got separated due to certain circumstances and after years of living apart they suddenly began to live under the same roof once again. Things were fine at first until Akiko began expressing her love for her older brother. Now Akiko must fight to defend her extraordinary love for her Onii-chan as she battles against all odds and three other girls who are after her beloved Onii-chan.


After the death of their parents, Akito Himenokouji and his younger twin sister Akiko were adopted by separate families. Six years later, they now live on their own, under the same roof. <br><br>
Akiko makes no effort to hide her brother complex. She even goes as far as trying to convince her brother to make their first night together a memorable one, to no avail. Akito calmly rejects his sister's many advances and deems loving his blood-related sister impossible. However, Akiko is determined to prove that love can overcome any obstacle.

Akiko Himenokouji