Daimajuu Gekitou: Hagane no Oni

Takuya returns to the military research facility where he once worked with his friend Haruka. Experiments involving mysterious matter unleash a destructive power, and Haruka becomes joined to the terrifying machine Doki.

Determined to save his friend, Takuya accepts a dangerous transformation of his own by merging with another machine, Hagane. Their confrontation tests whether friendship can survive a power capable of overwhelming the people who wield it.