Fate/Overarch

Fate/0VER.ARCH
A mysterious Servant has destroyed part of the Moon, causing a fragment of the Moon Cell to fall down to Earth. Due to the fragment of the Moon Cell colliding with Fuyuki's Greater Grail and shattering both into pieces, the Grail War System has begun to individually manifest all around the world in the form of Class Containers. Class Containers are manifestations of the concept of a "Class" - the container that Heroic Spirits from the Throne of Heroes are summoned into in order to become Servants.