This is a special to To Heart: Remember My Memories, which includes fighting scenes between all the female characters.

Shounen Ashibe follows the daily life of first-grader Ashibe Ashiya and his spotted seal pet Goma-chan. (Source: MAL News)

Moments after an atomic bomb falls over Hiroshima, a secret Japanese submarine sails into battle against its American counterpart, and both are lost to history. Some fifty years later, a special UN task force sent to investigate unusual phenomena in Antarctica is threatened by a mysterious black cylinder.

Episode 0 of Robot Girls Z.