Synopsis

Overwhelmed by bitterness, Douman undergoes a terrifying metamorphosis, becoming a colossal demon. Within him resides Antenmaru, a malevolent entity sealed away over a thousand years past by the combined efforts of the Ketsuno and Shirino clans. Just as Seimei faces imminent death at Antenmaru’s hand, Gintoki interposes himself, his wooden sword radiating with power. He channels the collective energy of those present, even drawing upon Douman's own, to overwhelm Antenmaru and dispel the encroach