Tokoshie x Bullet: Shin Minato Koubousen

In the project's story, unidentified giant weapons destroy the world's metropolises in 2029. The masterminds behind the destruction are known as Tokoshie. The Tokoshie call themselves weapons as they take over the streets with their overwhelming powers. Then, they vanish, and a decade passes. A certain military enterprise develops a battle drone that can fight the Tokoshie. A certain wealthy person goes underground to seek the Tokoshie's secret to living forever. A certain girl embarks on the path to battle with the Tokoshie, her parents' enemy. This is the chronicle of the long fight between humanity and humanity's foe Tokoshie. (Source: ANN)