TAIYOU NO KIBA DOUGRAM

The story is centered around a small group of guerilla freedom fighters on a colonial planet named Deloyer, who are known as the "Deloyer 7", or "Sun Fang" team. In an unexpected coup, the elected Governor of Deloyer becomes dictator and rules Deloyer under martial law with the support of Earth's Federation. Fighting for independence from Earth's Federation influence, the freedom fighters begin a rebellion against the Federation's Combat Armors using a Combat Armor of their own: the Dougram. — Description from AniList community (anilist.co).