The Cannon Namahage is capable of firing lasers from the floating heads it possesses. If the heads are destroyed and Amaterasu is close to the Namahage, it will attempt to kick her. It can also use the slap attacks of lower ranking demons, but without its laser heads, it is quite feeble and vulnerable.
"The Cannon Namahage is a strange beast, indeed. He doesn't care about the lazy, gravitating instead toward cowards and sissies, screeching and bellowing to scare some bravery into their victims. You might say they're rather kind, considering the circumstances."
A Cannon Namahage is surrounded by floating stone heads which will fire laser at Amaterasu, it will also protect itself with those heads. It is advised to Power Slash the floating heads so that it will be left defenseless and therefore easy to farm and kill. However, make sure that Amaterasu stays clear of the head when she Power Slash them, as the heads explode when they are destroyed. After clearing the heads, the demon will be stunned, so use this chance to farm it by using Golden Fury, Brown Rage and the Thief's Glove on it. Then usually the demon will attempt to kick Amaterasu. Use Sub-Reflector Counterattack to quickly kill it. If the Cannon Namahage does not execute the kick, then scribble over it with the Celestial Brush, which prompts it to flail its arms in a blind attack, then execute a Sub-Reflector Counterattack to kill it. When the demon is killed, use Galestorm as its Floral Finisher.