Bullied youth, Haiato Nanami, and his classmates are summoned to another world. While his classmates display combat-oriented abilities, Haiato only possesses the mundane ability of an alchemist. He is the weakest, and is pushed into a deep abyss by a classmate. In despair, he encounters the vampire, Tsuki, and finds a path to become the strongest alchemist. He vows to protect Tsuki, and together they will become the strongest, overcoming all challenges. This is the story of a boy who fell into the abyss and a vampire who lives in seclusion, joining forces to create a legend in this fantasy world.