If you're looking for manga similar to Mobile Suit Gundam: Iron Blooded Orphans 2nd Season, you might like these titles.
The manga will begin with an original story that depicts the blank period leading up to the resurrection.
Universal Century 0096. Three years after the last conflict between Neo Zeon and the Earth Federation Forces, the tentative peace of the Earth Sphere is about to be shattered again. Cardeas Vist, the head of the powerful Vist Foundation, has decided to hand over "Laplace's Box," the secret of the Foundation's prosperity, to the supposed enemy, Neo Zeon. Banagher Links, a student at the space colony Industrial 7, rescues a mysterious girl who calls herself Audrey Burne. Audrey is seeking to prevent a war, but it seems she has come too late. As Banagher's home colony is devastated by the attacks of the enemy mobile suit Kshatriya, he finds his strange destiny and is forced to fight in the formidable weapon system known as the Unicorn Gundam.
Outer space, the far future. A lone seed ship, the Sidonia, plies the void, ten centuries since the obliteration of the solar system. The massive, nearly indestructible, yet barely sentient alien life forms that destroyed humanity’s home world continue to pose an existential threat. Nagate Tanikaze has only known life in the vessel’s bowels deep below the sparkling strata where humans have achieved photosynthesis and new genders. Not long after he emerges from the Underground, however, the youth is bequeathed a treasured legacy by the spaceship’s coolheaded female captain.
A.S. (Ad Stella) 122. An era when a multitude of corporations have entered space and built a huge economic system. A lone girl from the remote planet Mercury transfers to the Asticassia School of Technology, run by the Beneritt Group which dominates the mobile suit industry. Her name is Suletta Mercury. With a scarlet light burning in her pure heart, this girl walks step by step through a new world.
The human race extended it's life field and greed to the vast reaches of space... In Space Era 0156, a war breaks out amidst all of the colonies in space. Earth begins to construct a new space battleship called Tiramisu in secret. Just as the war begins, one genius pilot steers the Tiramisu as a beacon of hope for humanity.
Leif Recitativo was ordered by Veda to gather a group of living bio-terminals called Innovades. But members of Celestial Being's shadow group Fereshte (which is now disbanded and rejoined the main organization) reappears.