Gishin Eiyuu no Amadeus

Due to the existence of a different dimension that erodes the world, the human race has been destined to be destroyed ... and its whereabouts are left to a certain "love"! Seijiro Kasugayama, a young man who fights as a hero with a girl born as a [weapon] Misaki Yamabuki. When the love of two people begins to move, the battle with fate begins! (Source: MU)