Takeru visits the peaceful world he originally came from to recover the research necessary for Alternative IV to be a success. Upon his return to the war-torn world ravaged by the BETA, he discovers a surprise that brings him one step closer to victory... and danger.

A new set of trials testing the combat readiness of Takeru's XM3 operating system takes a turn for the dangerous.

After a soul-shaking brush with tragedy, Takeru decides to return to his home world.

With it now obvious that he's having unexpected effects on his peaceful home world, Takeru has to make a tough decision.

Takeru returns to the world ravaged by the BETA, only to be shocked when Professor Kouzuki introduces him to 00 Unit.

As Takeru grapples with the truth about the 00 Unit, a deadline to get it functional looms.

The A-01 Squad find that they will be part of a joint operation between the UN and Japan to attack the BETA hive on Sadogashima.

The mission to retake Sadogashima is underway, and the Valkyries take to the battlefield.

The Susano-O arrives, and the outcome of Operation 21st will depend on the performance of the flying fortress.

With the Susano-O inoperable, the Valkyries move to recover the 00-Unit as BETA continue to swarm Sadogashima.

A massive horde of BETA surfaces from beneath Sadogashima, putting the A-01 Task Force and success of Operation 21st in danger.