 If you liked
Blue Gender
|
 ...then you might like
Koukaku no Regios
|
Blue Gender and Chrome Shelled Regios are set in an apocalyptic event in which the planet has been dominated and the humans are set as food. Also the main characters in both anime refuse to fight in the beginning but later find a resolve to fight for what they believe is worth protecting.
Only difference is that Blue Gender has Mechs and tends to be more serious
While Chrome Shelled Regios uses Kei enhanced weapons and has some light comedy to balance out the seriousness but both are still amazingly awesome shows