Zenki

Zenki (鬼神童子ZENKI, Kishin Dōji Zenki) is a Japanese manga series written by Kikuhide Tani and illustrated by Yoshihiro Kuroiwa and was serialized in the Shueisha publication, Monthly Shōnen Jump from 1992 to 1996.It was later adapted into a fifty-one episode anime television series in 1995 by Studio Deen and also spawned five video games. Enoki Films handles the English language version of the anime.

Plot
Long long ago, the great Bodhisattva of Japan, Ozunu Enno, controlled the Demon Gods to defeat the Demon Goddess Karuma. After Karuma's defeat, he sealed away one of his Demon Gods, Zenki, in a pillar until needed again.

Centuries later, his direct descendant, a school girl named Chiaki Enno is able to free Zenki, although the fierce demon lord currently has the form of a bratty demon child. To transform this extremely defiant demon into the form that made him useful by her ancestor, she uses a bracelet that appeared on her wrist when servants of Karuma broke the seal that imprisoned a seed of Karuma. Zenki reawakens because the seeds of Karuma (which look like eyeballs) start appearing and turning people into monsters and Zenki is needed again to eradicate this menace.