The origins of Lieu were coming from one of Oguma's experiments. However due it's unstable state, Oguma decided to abandon Lieu inside the North Pole's Alator. In 2030s after South Pole's Alator were activated in favor of Lugus, it inadvertently also activated North Pole's Alator which resulted the awakening of Lieu causing it to travelling towards South Pole's Alator. After Lugus almost defeated, somehow Lieu managed to reach South Pole's Alator much to surprise for both Oguma, Marco, Eri, Tarma and Fio. Lieu then unleashed a reddish fluid-like flesh towards Lugus consuming it and trapping the Regular Army cadets inside. Rumi Aikawa then drops the SV-001 in order to destroy Luu. Once defeated, the Luu starts collapsing with Marco, Eri, Tarma and Fio escape via Regular Army's Hi-Do while Oguma and his hencemen left behind. Oguma then consumed by Luu causing it to be destroyed in a huge energy blast.
He's shoots laser with many eyes (Not the main Eye), some eyes can be destroyed either dropping golds, weapon items, health or gas. After few moments, it grows 2 arms with one eye in both arms. The eye acts similar with previous eyes. If you get close to the arms it will slash you with it's finger. When one arm were defeated, Luu's main eye were exposed Should the both arms were defeated to give you extra time, at this point several faces starts raining the area. If the player hold enough the one arm in long time. The arm will retreat and the face are trying to eat you, then several arms try to punch you before finally a Foot fall from above trying to crush you. When enough damage are taken the Luu endlessly screaming while the faces keep falling from the roof.
- The smaller faces have ears while the main big face doesn't.