I guess you're being downvoted because of how you said it, but you're not wrong. I have a Japanese keyboard too, albeit not a Mac one, and the underscore needs shift (without shift, it's backslash, which means that yes, I don't need to use M-¥). Caps lock is also under tab, and Control on the bottom left.
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That's an Apple Japanese keyboard.
Apple messes with the standard keyboard of all layouts.
I guess you're being downvoted because of how you said it, but you're not wrong. I have a Japanese keyboard too, albeit not a Mac one, and the underscore needs shift (without shift, it's backslash, which means that yes, I don't need to use M-¥). Caps lock is also under tab, and Control on the bottom left.