Cosplay public gangbang hentai

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I wasn't around to bump my thread yesterday, so I'll copy, paste and try again:
I remember watching a hentai some years ago about a girl that cosplays for the first time, and gets fooled into thinking gangbangs were the usual thing her character does.
It's not Cosplay Roshutsu Kenkyuukai (pic related) but it's very similar, maybe a bit older.
I believe she was a redhead and she got double penetrated and everything out in the open, but noone really seemed to give a shit besides the group of nerds she was with.
In the end some guy she was with earlier finds her covered in cum and she tells him they taught her how to be a cosplayer, then she sees the group that fucked her and screams that they violated her (she wasn't angry, it was all happy sex) so some cops go and arrest them while she looks on confused.

Anyone knows the name?

When I saw it in the archive, an anon had suggested it might be either Kanariya wa Kago no Naka
or Jinkou Shoujo. Those aren't it either.