Apple's Japanese keyboard has five special keys.
https://www.apple.com/shop/product/MXK83J/A/magic-keyboard-with-touch-id-and-numeric-keypad-for-mac-models-with-apple-silicon-usb-c-japanese-black-keys
The key code constants are as follows.
kVK_JIS_Yen
kVK_JIS_Underscore
kVK_JIS_KeypadComma
kVK_JIS_Eisu
kVK_JIS_Kana
It would be great if these keys were supported.