There is never a quiet day in the Kobayashi home, with mischief being a daily feature as Tooru pursues her ambition to become the finest maid and Kanna Kamui thoroughly immerses herself in her life as an elementary school student. On one such day, though, a gigantic landslide is witnessed on the hill where Kobayashi and Tooru originally met, demonstrating the might of a dragon. When none of the dragons they know claim guilt, the offender herself descends from the heavens: Ilulu, the radical Chaos Dragon with tremendous strength rivaling Tooru's. Sickened by Tooru's engagement with humans, Ilulu resorts to the traditional dragon method of conflict resolution—a battle to the death. Despite this, she is captivated by Kobayashi's ability to befriend dragons.