Total Recommendations: 3
They are both sci-fi mecha with an emo protagonist who doesn't want to fight, but has to in order to protect. The storylines and themes are different, but is packed with action and suspense.
They are both anti-heroines who are trying to, not save Earth, but make sure evil beings don't harm humans. They both were sent to Earth on a mission with fire as their element. Despite having no feelings for humans, they both befriend some and disguise themselves as school girls. There is also a dark motif where humans die, and Shana and Miyu don't feel any sorrow for their death. Also, they have a male compainion who helps them.