Meisuke Nube Nueno, a teacher at Doumori Elementary School and expert in the occult, finds it increasingly difficult to protect his students against dark forces. After one of his students is sent to a parallel world, Nube encounters an unusual spirit that sends him back in time to change one regretful event. Although Nube manages to fix the situation, this succession of unlikely events suggests that a more serious menace may be threatening the peace of Doumori. To protect everyone he holds dear, Nube will have to overcome the demons of his past and uncover the nature of the looming supernatural danger.

In Doumori, an imbalance of spiritual forces threatens to plunge the small city into complete chaos. Thankfully, for the students of Doumori Elementary School, new teacher and exorcist Meisuke Nube Nueno is determined to prevent the malignant spirits—known as youkai—from accomplishing their evil deeds. The first student who catches Nube's attention is transfer student Hiroshi Tateno, who displays inexplicable outbursts of anger, often lashing out at his classmates. When they find out that Hiroshi is possessed by a youkai, Nube manages to free his student thanks to the demonic power sealed in his left hand. However, a youkai hiding behind the appearance of doctor Kyousuke Tamano bursts onto the scene and quickly abducts Hiroshi. Helped by his student Kyouko Inaba and his expertise in the occult, Nube quickly uncovers Kyousuke's sinister plans. Rushing to Hiroshi's rescue, Nube will show once more that he will stop at nothing to protect his beloved students against all supernatural threats.

Millennium Research Institute, a counseling office where bizarre requests come in. The head of the research institute, Ichirou Umoregi, also known as Akuma-kun, a genius boy who only appears once in 10,000 years. However, he doesn't know his real family. So Akuma-kun, along with his partner Mephisto III, pursue the mystery of his origin while challenging mysterious cases in this mysterious detective buddy story. (Source: Fandom)

Second season of Kinnikuman: Kanpeki Chоujin Shiso-hen.