Amate Yuzuriha is a high school student living peacefully in a space colony floating in outer space. When he meets a war refugee, Nyan, Amate becomes involved in an illegal mobile suit dueling sport known as Clan Battle. Object name « Urine »; He plunges into fierce battle day after day, piloting GQuuuuuuuX. Then an unknown mobile Gundam suit appears in front of him, pursued by both space forces and the police, along with its pilot, a boy named Shuji. Now their world is entering a new era.