Cast: ISHIKAWA Yugo

The lead character, Mao Ran, a person of Chinese origin born and raised in Japan, has been trained in the secret martial art of her family by her drunken lecherous grandfather. Her grandfather has promised her that he'll tell her what happened to her parents to encourage her to train and fight. Without her knowledge, her grandfather signs her up to participate in a televised martial arts competition between female martial artists known as "Prime Mat".

Yoshiko is a hardworking high-school student whose free time is almost entirely taken up by attempts to help out a hikikomori childhood friend and an odd, reclusive uncle. While on a visit to her uncle's penthouse with two of her friends, Yoshiko notices a black substance that resembles snow beginning to fall from the sky -- but her friends see nothing. Soon afterwards, a massive earthquake shakes the city, and Yoshiko, her friends, her uncle and his dog, all find themselves trapped in a strange world they do not recognize...with an assortment of weird people to keep them company.