Top 10 in Top 10 most popular anime of Ufotable.
God Eater
God Eater is a story set in the year 2071. When an unexpected incident happened, humanity was pushed to the brink of extinction after the appearance of man-eating monsters called "Aragami". They are immune to conventional weapons. The arrival of this monster ravaged the land, consuming almost everything in its path and leaving nothing in its wake. In order to be able to fight this dangerous monster, an organization called Fenrir was formed as a last-ditch effort to save humanity through the use of "God Eaters", special humans infused into the cell. the Oracle, allowing them to use the God Arc, the only known weapon capable of killing an Aragami. One of such Eaters is Lenka Utsugi, a new Type where God Arc takes the form of both a blade and a gun.
Now, as one of Fenrir's greatest weapons, Lenka must master her God Arc if she is to fulfill her wish to wipe out Aragami once and for all. The monsters continued to be spawned in droves while the remnants of humanity struggled to survive the night. Only God Eaters stood between Aragami and the complete and total destruction of humanity.