The Getter D2 Squadron needs two more pilots to protect Earth. Meanwhile, Takuma hunts for his mother's killer and heads to the Saotome Research Lab along with Baku.

Takuma and Baku become pilots for the Getter Arc on Hayate's order. Meanwhile, a space-time gate opens above the Saotome Lab and the enemy attacks en masse.

Takuma, Kamui and Baku launch their Get Machines as Shikishima's defense system activates. During the intense bombardment, they combine into Arc and confront the enemy army.

Getter Ray research may be the key to the enemy's transportation system. Meanwhile, Takuma, Baku and Kamui find themselves by a gate to the old lab.