on the surface, takaoing kiyoshi (voiced by sakurai takahiro) is a bad boy who is withdrawn and does not fall in love with school, but he is actually a genius with super high iq. ccc。 one day, a boy with a strange appearance found qingli. the boy told qingli that his name was kashu (voiced by yui otani). the purpose of this trip was to repay his kindness. in this way, qingli took in kashui and the two of them lived together officially began. in the red book that kasu carried with him, clues about kasu's amnesia were hidden, and qingli actually easily understood the strange words on it, thus starting a magical relationship. it turns out that in this world, there are many children like kashu who carry magic books. between them, a huge war continues with the purpose of destroying the rest of magic books. kashu and qingli were also involved in this cruel war.