Teen Exorcist, Vol. 1 (manga) -

Japan's Heian Period. Masahiro serves as a royal diviner just like his grandfather, the legendary Abe no Seimei. His dream isn't to follow in his grandfather's footsteps, though--it's to surpass him! During some intense training with his spirit companion, Mokkun, Masahiro notices an ominous presence targeting the princess...Can he protect the royal capital and escape from his grandfather's shadow?! \nPurge evil spirits, protect the princess...It's all child's play for this teenage exorcist!!Like his grandfather before him, thirteen-year-old Masahiro serves the Japanese Imperial Court as an exorcist. His predecessor isn't just anyone, though--he's the living legend Abe no Seimei! Meanwhile, Masahiro's stuck being called Seimei's grandson. But the teenage exorcist has no intention of spending his days in his gramps's shadow, and his chance to prove himself may come sooner than expected...When he notices an insidious presence targeting the princess, will he finally get his turn in the spotlight?!