Yuri and Hiina continue their adventure while accepting quests to save the world. One day, they receive a quest to defeat the 'Demon King.' As the two head to the client after accepting the quest, they find that a spirit is waiting for them. After hearing the circumstances leading to the birth of the 'Demon King' from the spirit, a powerful 'Demon King' appears before Yuri and Hiina. What will be the fate and choices of the two?