Kouichirou Shindo's personal editor, Kaoruko worries that [Akito](https://anilist.co/character/54725) has a sister complex and is trying to fix it.

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) 

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

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.

Kaoruko Jinno