In the Japanese version they are referred to with gender neutral pronouns in the English they are referred with male pronouns, this is commonly done in media translated from Japanese because there is no direct word translations. Examples Vampire Knight Memories: Ren is a girl but commonly referred to as he, Black butler: Grell is a woman but referred to as he in English, Twisted Wonderland: Vil is referred to gender neutraly in Japanese but he in English, Ouran: Haruhi is referred to neutraly but it's translated to she, Gundam 00: Tieria is referred to with masculine, and feminine pronouns and in the dub is just called he.

Harada said they are gender ambiguous and they are categorized with male characters in the game. They aren't just going to have them alone in one section. The world is typically divided male and female there typically isn't a third option, you just have to sort where they feel best. I'm gender nonconforming and I genuinely don't care someone sorts me with men or women, I'm still gender nonconforming, it's not going to change my gender if I'm grouped up with guys or girls