/usr/share/ibus-mozc/hiragana.png is in ibus-mozc 2.20.2673.102+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/ibus-mozc/../icons/mozc/ui-hiragana.png
/usr/share/ibus-mozc/../icons/mozc/ui-hiragana.png