Consumed by negative emotions, Douman is transformed into a giant demon. He now possesses within his body Antenmaru, a demon sealed away over a millennium ago by the desperate efforts of the Ketsuno and Shirino clans. Not even Seimei’s voice can reach to Antenmaru when Gintoki stands before him with his aura-charged wooden sword. How will Gintoki fight the great demon who has returned after a thousand years?!
Behold the difference between us and
the ill-mannered Ketsuno clan!
¡Les mostraremos que no somos 
como esos maleducados Ketsuno!
Contemplem a diferença entre nós 
e aqueles Ketsuno mal-educados!