Brynhildr in the Darkness 01

In his childhood, Ryouta had to cope with a dramatic event: his friend Kuroneko, who was firmly convinced that aliens exist, died in a tragic attempt to prove their existence to Murakami. Since then, Ryouta has devoted all his energy to trying to prove the existence of aliens. One day, when a new classmate appears in his class who looks exactly like Kuroneko, Ryouta's world is turned upside down. He is convinced that Kuroha is the childhood friend he thought was dead...