 If you liked
Koukaku no Regios
|
 ...then you might like
Shingeki no Kyojin
|
You've got a squad of your own yes... But Not being able to leave your hometown because of aliens is another!
Humans live in a mobile city/military city protected by glass shell and they can't go outside because of alien like creature and the atmosphere is not stable
In a post-apocalyptic setting, humanity have been feared by these unidentified monsters that are attacking humans. The characters, in here, usually stay in a place that is shielded around them to prevent them getting killed. To counter attack these creatures, the military used tactical strategies to fight them off and finding the mystery of their origins. Swords, and supernatural themes were used in combat.
The difference is that Chrome Shelled Regios, is somewhat more of a light tone, battling monsters, and uses magic to fight. Shingeki, features a much more darker tone, battling "Titans", and uses a 3D maneuver gear to fight.