>>280464027Kosaka-kun is almost certainly a guy, although we had no 100% confirmation. We're talking about Suguri from the past, who certainly looks like a guy, but it's plausible that Suguri could end up being a reverse trap (technically voiced by a female voice actor, although that's common for young male characters).
On the website in Suguri's profile it's stated that Nozomi is attracted to Suguri's looks.
>希が一目ぼれするほど容姿端麗Sadly no English version of the sengoku characters' profiles which might have confirmed the gender, but English translations made by the Japanese are also bullshit a lot of the time, so yeah. We'll have to see.