Kuroki Ryuu to Tasogare no Sho [Failed]

"Kill the Black Flame Dragon, the enemy of all humanity" The dragon slayer receives a request to slay the Black Flame Dragon, which has been residing in seclusion within the depths of what people call the Wandering Forest. That dragon, which has already claimed the lives of countless people, is certainly the enemy of all humans. Dear dragon slayer, please kill the Black Flame Dragon, and restore peace to the world of humans. And please, see this story to the very end.