9 Tsuki no Asa wa Kamisama mo Shiranai

A high school girl named Orihara Saki experiences a dream in which she sees the death of God, the most revered and powerful entity in the world. This vision is followed by a real-life attack from a creature known as the Heart Scar Bug, which preys on humans. During the attack, Saki acquires a weapon referred to as the "sword of lone being." Now known as Matoi, she wields this weapon and becomes involved in a conflict against the Heart Scar Bug and the Ark of God, which is described as God's kin. The goal of this battle is to prevent the destruction of the world in a reality where divine beings no longer exist.