DrunkenWhaler said: Why does she remind me of Katyusha..
It's tagged Girls Und Panzer on Pixiv, so it probably is a parody of Katyusha, plus if wasn't a parody, Sakuya would probably be having a massive nosebleed by now.
Why did this never cross my mind!? Remi and Sakuya make the perfect Katyusha and Nonna. Now I'm eagerly waiting for a doujin parody of Girls Und Panzer. I mean, Touhou has parody everything else at least once so far, right?