The production originally confirmed that they intend to bring out the three remaining parts sometime in 2020, but COVID-19 definitely threw a wrench into those plans.
The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy.
The first three episodes came out back with a May 17th, 2019 debut with the next three episodes getting their theatrical run on November 8th, 2019.
With most of Earth in ruins, humanity’s survival relies on these youths’ selfless determination to protect the only home they know.