Seven years after it's predecessor, Fumina Hoshino is the host of the Gunpla club in her high school, and, unfortunately, she is the only member and in danger of it being shut down. When a transfer student, Kamiki Sekai asks for the "fighting club", she takes him to the Gunpla club instead, he originally declines, but eventually they start fighting battles with their Gunpla, and from there on they start reaching for the top together.