A strange, silent warrior appears. When the Inferno armor is summoned to battle him, the mysterious warrior calls forth his own armor—a black copy of the Inferno armor! Now, the warriors will find themselves half a world away fighting once more to save humanity, but this time, from their own armor!

The first OVA, Burning Clock, tells the story of the Aiba family, goes into further detail about Shinya and Takaya's rivalry.

Extra anime shorts included on DVD. Episode 1: Summer Memories (Vol. 1) Episode 2: The Meteor Distance (Vol. 3) Episode 3: Twinkle Star (Vol. 5) Note: Music video specials are not included in the entry as they don't contain any new scenes.

Toyotomi Hideyoshi is on the verge of unifying the realm, and all that remains is the Odawara Castle protected by the "Lion of Sagami" Ujiyasu Houjou. Hideyoshi's personally trained generals—Ishida Mitsunari, Katou Kiyomasa, and Fukushima Masanori—as well as Ootani Yoshitsugu, Shima Sakon, and Naoe Kanetsugu are all on the frontline of the battle. Amidst the battle formation are the two young warriors of the Sanada household: older brother Nobuyuki and younger brother Yukimura. As the stalemate begins to break down, Sanada Yukimura rides on a lone horse into the fray. His brother follows him right after. (Source: ANN)