Во-первых, завязка интересная:
The story centers on a second grade high school student Ryota Murakami. He still can't forget about his childhood friend Kuroneko who was killed in an accident. To fulfill the promise with her to prove the existence of extraterrestrial beings, he joins the astronomy club and looks up at the sky every night. One day he meets a witch named Neko Kuroha who has escaped from a research lab. She looks exactly like Kuroneko.
Во-вторых, арт красивый: