Kaminaki Sekai no Oneechan Katsudou The Godless World of Oneechan

Synopsis

In a world where the concept of God does not even exist, a woman as precious as a "god" has been reborn! In search of her beloved brother, Yukito, the strongest sister goes on a rampage in another world—the myth of the oneechan has now begun! (Source: Hero's, translated)