Yoshimori Sumimura is a 14-year-old student at Karasumori School. Following in the tradition that's come down through the generations, he is the twenty-second Kekkaishi of the Sumimura clan. But he’s constantly fighting with his rival, Tokine Yukimura—his childhood friend and also a Kekkaishi—about who is the rightful heir to the magical barrier arts. Protecting people from danger while growing stronger himself, Yoshimori will battle the forces of evil again tonight!

童年一次目击UFO的神奇经历，就此改变了南波兄弟的一生。2026年，弟弟日日人（KENN 配音）实现梦想，将随同NASA的同行一同登上梦寐以求的月球。与此同时，才华横溢且在汽车设计领域小有名气的工学博士哥哥六太（平田广明 配音）却因冲撞上司而被开除，更遭到全行业的封杀。倔强高傲的六太在求职道路上四处碰壁，情绪渐渐跌入谷底。就在这个关键时刻，弟弟当年的录音唤醒了他对“一同能上月球”的约定的记忆，六太重整旗鼓，参加选拔集训，与弟弟朝着童年的月球前进……
本片根据小山宙哉的同名原著改编，该片也于2012年被改编成真人电影版搬上银幕。

Mt. Soukai is in danger and Wataru is here to save it again. However, Ryujinmaru was broken into pieces during the fight with the mysterious enemy “Dobazudar”! Wataru fell into despair, but suddenly he heard Ryujinmaru’s voice. Ryujinmaru is still alive! Then Wataru sees a vision of Mt. Soukai being upside down. That place is called “Mt. Musokai”, “the dream of the dragon”. It’s located somewhere unknown. Knowing Ryujinmaru is in that world, Wataru is here again, on an adventure with Toraoh and Himiko.