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Artist's commentary
Cosplayer Marin Kitagawa Caught Masturbating
"Ehh, what is it, Kitagawa-san!?!?! What is it??!?!? Kitagawa-san??? Kitagawa-san??????"
The original title オナバレイヤー is probably a portmanteau of オナニー (masturbation), ばれる (to be exposed), and レイヤー (short for "cosplayer")