Hello! I found your blog by chance (and I feel so blessed) I don't really follow Aoharu x Kikanjuu so I don't know, but do Matsuoka and Yukimura know that Hotaru is a girl? thank a lot ~
Hello, welcome to my chaotic blog!
To answer you question, you know they first mistaken her as boy because of her tomboyish mannerism and also because according to her words the male school uniform fits her better, so she tends to wear neutral/male clothes?
Alright, after some back and forth and a bit of drama, she decides to tell them the truth - except they did not believe her, taking it as a joke of hers. (Hotaru even made Matsuoka touch her chest as proof but due to various reasons he simply didn’t notice/was too distracted to feel anything also Hotaru really barely has boobs.) Since they still kept the rule of no girl in the team at least for the TCG, she decides to let them not believe her and continued her ‘guise’ as boy.
So as for right now, Matsuoka and Yukimura both don’t know (or believe) she is a girl. Until now the only ones among the Survival Game participants who know are Midori and Haruki, the new old forth member of Toy Gun Gun. Maybe that will change in the next month!