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…
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The story is set in a world embroiled by war between Humans and Demons. The Humans' greatest hero invades the Demon Queen's castle determined to vanquish her. However, instead of fighting back, the Queen proposes an alliance with the Hero. She explains how a sudden end to the war can bring further chaos to the world as the Humans once united to stand against their common…