Black Bullet, Shingeki no Kyojin Season 2 Recommendations
Here you have Attack on Titan but with lolies...
They are all trapped behind walls by big bad bugs.
In order to to save humanity from the brink of extinction from a mysterious catastrophe, the remaining people have built a barricade around the area that they live in. In both series, only a few special individuals have the power to fight the monsters. While SnK is set in a medieval-ish world, Black Bullet is set in a futuristic one.
Both MC are voiced by Yuki