This story revolves around a shut-in otaku named Shiro Akashi.

When he was a kid, his father disappeared. Because of that, Shiro stopped going to school. In loneliness, he devoted his life playing games and watching animes.

One day, as Shiro woke up from his bed, he saw someone sitting on top of the table on the other side of the room.

That person, a girl with black wings, two horns and a tail, wearing nothing but a bra and her underwear, covered in a coat, hiding her face, appeared right in front of him.

This girl suddenly said that she will be Shiro's girlfriend

Will this encounter bring good luck? Or will he continue to waste his time watching animes and games?