After the Armor Heroes united to seal up the Dark Forces Monsters, the city regained its peace and happiness. Since Monster Ten was not successfully sealed up, Mei Zhen found Zi Yang, hoping that when danger and difficulty arises, Zi Yang would be able to seal up this last monster and would completely eradicate the forces of darkness on earth. Meanwhile the Five sealed in the Monster Sealing Box, in order to fulfill their quest for world domination, used the forces of darkness to entice an angry youth, and created new mutants to create havoc in the city.
Zi Yang's good friend since childhood, Ah Jie, accidentally meets his long-time infatuation, female reporter Tong Tong. Tong Tong mistakes Ah Jie for an Armor Hero. In order to keep up the pretense, Ah Jie borrows the Armor Hero Belt for the date, but encounters the mutants and damages the Armor Hero Belt and renders Zi Yang unable to transform. The forces of darkness have made a comeback; they vow to destroy the earth and doom mankind to endless darkness. Can Zi Yang put on the armor and save the earth?
铠甲勇士们战胜了暗影黑魔兽，地球重新回归了平静和安宁，然而，唯一没有被封印的魔兽10号成为了美真（杨亚 饰）的心头大患，她找到了子阳（唐禹哲 饰），将保护世界和平的重任交付给了他。
子阳和阿介（袁成杰 饰）是从小到大的好友和玩伴，两人共同经营着一辆名为“幸福一口”的餐车，生意十分红火。巴豆（廖晓晨 饰）是沉迷于网络世界的宅男，同时亦是经验丰富的网络黑客。现实中，巴豆个性内向毫不起眼，甚至常常受到周围人的欺负。暗影护法相中了巴豆，两人定下了契约破坏铠甲，与此同时子阳和阿介因为误会而产生了矛盾，重要的铠甲召唤腰带亦遭到损坏。在如此危机的情势之下，子阳最终能够反败为胜吗？
