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Queen of Quality Season sung by Darjeeling (Kitamura Eri) in red and Orange Pekoe (Ishihara Mai) in blue. Credit to reddit user /u/changl09 for translating the song, Kitamura Eri and Ishihara Mai for singing it, and Girls und Panzer Projekt for everything.
This is the original source of the fanart:
WACOCA: People, Life, Style.