After Lynn Okamoto, author of Elfen Lied, began publishing his Brynhildr in the Darkness (Gokukoku no Brynhildr) in Weekly Young Jump in 2011, the magazine has announced that the manga will come to an end in issue 18, to be released two weeks from now on March 31st. After the final chapter, the series will have run for 18 volumes, as well as being adapted into a 2014 anime.
Crunchyroll, who ran a simulcast of the 13-episode anime, describe the series:
When he was a child, Murakami was infatuated with a girl he called Kuroneko. She insisted on knowing about aliens and having met them, but no one believed her, even young Murakami was skeptical. One day, she decides to show him the aliens, but an accident occurs and Kuroneko dies while Murakami is left seriously wounded in the hospital. Years go by and Murakami obsesses on finding proof of the existence of aliens because of a promise he had made with Kuroneko. Then, one day, a new transfer student comes to his class, who not only looks a lot like Kuroneko, but is named Kurohaneko.