Shingeki no Kemono - Attack on Monsters

Most of humanity has been wiped out by sudden attacks of gruesome, demon-like monsters, only protection serving a gigantic invincible force field of unknown origin. It wasn't enough to fully protect the citizens since their planet was dying in rapid speed, allowing the monsters to distribute. Among all the secrets hidden from the public eye, a strong team of specialists is send for a few years to investigate, free territory and prevent the population from starvation.
Levi and Eren were a few of them. Right at the start of their journey they have to realise their strong connection towards each other, brought together by fate and the heavyness of this apocalyptic/dystopian world. Before the troubled corporal can voice his thoughts after finally finding one true friend, events escalate towards an absolutely catastrophic extent. Everything seems doomed, if not for the captain suddenly waking up at the exact same day in the morning, at the exact same time. Beeing trapped in an infinite time window Levi has to find out how to escape the catastrophic events and come to term with his feelings for his cadet. But things turn out differently then expected.