|Name in Japanese||赤城 浩平|
|Romaji Translation||Akagi Kōhei|
|Appears in||Light Novel, Anime|
|Voice Actor (Japanese)||Junji Majima|
|Voice Actor (English)||Yuri Lowenthal|
|Family||Sena Akagi (Younger Sister)|
Kōhei Akagi (赤城 浩平, Akagi Kōhei?) is Sena's older brother and one of Kyousuke's classmates. Unlike Kyousuke who has a complicated relationship with his younger sister, Kouhei is a supportive brother to Sena, despite her fascination to hardcore yaoi. He prods Kyousuke about his relationship with Manami.
He is voiced by Junji Majima.
Kyousuke is one of Kouhei's friends. They share the same status: both of them have a little sister.
Kouhei's little sister. She is a fujoshi (腐女子?, lit. "rotten girl") who loves to fantasize about men loving each other. Kouhei is a supportive brother to Sena, although Sena doesn't want to admit that she and her older brother are close to each other.
When Sena tells everybody in the Games Research Club that she fantasized Makabe being gang-raped by the other club members, it causes Makabe to have a deep trauma. Sena goes wild all of a sudden, and Kyousuke have no other choice but to call Kouhei to calm her down.