Kurofuku

When Kazuki Azuma returns to Japan after 10 years, he gets assaulted by a group of armed men and becomes their prisoner. Asabuki Kogane, a childhood friend, saves him with a weapon on her right hand known as Bubuki; a weapon with its own mind. Kazuki Azuma, who is a Bubuki user himself, learns about the existence of Bubuki and goes on a journey alongside the companions he has…

A high school senior Murakami Ryouta had a childhood friend called Kuroneko who died in an accident. Ryouta had made a promise with Kuroneko that he will prove there are aliens in the universe. In order to fulfil his promise, he joined the astronomy club at the school as its only member and kept observing the stars almost every night. One day, a girl who looks like Kuroneko…