As far as I can tell, it's a weapon from the game Wagyanland. It's a rapid shot sonic cannon.
CheekinessLearned to use Wagyanizer*
*I have no idea what this isHatsune Miku - Today's Training Results~MischiefSex AppealPerversionFrom tomorrow, leeks will be available for purchase at the vegetable store.Can now travel to the Leek Kingdom.