Golden Boy Kashu OVA

On the surface, Takamine Kiyomaro (voiced by Sakurai Takahiro) is a delinquent boy who is withdrawn and doesn't like to go to school, but he is actually a genius boy with a super high IQ. One day, a boy with a strange appearance found Qingmao. The boy told Qingmao that his name was Kasu (voiced by Ikue Otani), and the purpose of this trip was to repay his kindness. In this way, Qingmao took Ka Xiu in, and their cohabitation life officially began. In the red book that Ka Xiu carried with him, there were hidden clues to Ka Xiu's amnesia, and Qingmao actually easily understood the strange words on it, thus starting a magical adventure. It turns out that in this world, there are many children like Ka Xiu who carry magic books, and a mighty war continues among them with the purpose of destroying the other magic books. Kashu and Kiyomaro were also involved in this cruel war.