The episode will be counted as the 5th episode of the series.
[Full schedule list]
Episode 5: Friday, March 24, 2017
Episode 6: Friday, April 28, 2017
Episode 7: Wednesday, May 31, 2017
Episode 8: Friday, June 30, 2017
Synopsis via gundam.info

Daryl, the pilot of the amazing Psycho Zaku that annihilated the Moore Brotherhood's fleet in the Thunderbolt Sector at the end of the war, descended to Earth after losing his mobile suit. He has been given the secret mission of seeking out a faction within the Federation called the South Seas Alliance.
Meanwhile Io, who fought a fierce duel with Daryl, has been selected as pilot of the prototype mobile suit Atlas Gundam and sent to Earth. His new battleground will be the continent of Australia, which still bears the scars of the colony drop, and the South Seas which surround it...
HG 1/144 Gundam Atlas announced as they revealed the second season's trailer in November 2016.
Source: Gundam.info
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