Brynhildr in the Darkness

Haunted by memories of his childhood friend Kuroneko, Ryota Murakami has dedicated himself to discovering the truth behind the claim she'd made before she died: That aliens from other worlds walk among us. Believing that becoming a scientist is the path to the truth, Murakami pursues his studies by day and peers through a telescope at night. But when a girl named Kuroha Neko joins his class, the answers he's sought may be closer than he ever expected.