Daimajuu Gekitou Hagane no Oni

In 1999, a group of UN scientists on the remote island of Sansara attempt to harness a new energy source, inadvertently opening a portal that releases dormant biomechanical beings. Three years later, Takuya Goroza is drawn back to Sansara at the request of his childhood friend Haruka Alford. As he arrives, he begins to suspect that Haruka may not be who he believes.