Japanese keyboards also have Latin labels, so it's at least possible to put two and two together there, although it would probably be better to write 'η΅δΊ (γ)' (unless there are local conventions to the contrary).
Effectively nobody in Japan uses or even knows the kana keyboard layout though, only QWERTY. My comment was more that they may not know the word "quit" for the Q to be meaningful to them... not that they can't find it on the keyboard.
Similarly as an English speaker I would be quite confused if the shortcut key for exit was a totally different letter like P or something.
