Since the Light and Shadow Armor sealed the Shadow Emperor, the Xingtian Team eliminated the Netherworld Demon, and the Nava Team dismantled the Oxer virus, the dark forces on the surface of the earth have temporarily calmed down, but the threats hidden in the "emotional dimension" are quietly growing. As early as the period of light and shadow civilization, ancient pioneers discovered the "Xu Realm Energy" contained in human emotions. In order to resist the aggregation of negative emotions, Heavenly Dao automatically formed the five armors of Bing Chi, Lei Kui, Fen Lin, Xuan Lang, Lan Huang, and the ultimate Royal Emperor Armor, which are passed down from generation to generation by the "Xu Guardian Clan" who specialize in guarding the balance of the Xu Realm.
In 2025 AD, due to the surge in negative emotions in human society, a "rift in the heart" appeared in the barrier between the emotional world and the real world, and the negative emotion aggregate "Strong Love Demon" broke through the seal and invaded. The modern secret organization "Anxu Bureau", which inherited the tradition of "Armor Summoner Selection" in Light and Shadow Village, began to look for the descendants of the Xu Guardian Clan and "emotionally qualified people" to awaken the sleeping armor.
