The original manga revolves around high school boy Ryōta Murakami, who cannot forget his female childhood friend whom he let die in an accident. Feeling that he must fulfill their promise of proving the existence of aliens, he has continuously looked up at the sky as a member of the astronomy club. One day, a girl named Neko Kuroha who looks exactly like his childhood friend appears as a transfer student. It turns out that she is a magic-user that has run away from a research lab. 

(Source: Anime News Network)

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! 
And even though she insists on never having met Murakami before, the girl has superhuman strength and seems to even be able to predict the future! 
How will Murakami's life change now that he has been saved by this mysterious girl that claims to be a magician?

Unaired episode 11.5 included on the second Blu-ray/DVD volume. The fight for Ryota's affections continue after a misunderstanding. The girls vie for his attention with a series of competitions, all with disastrous results.

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