High School DxD is a Japanese light novel series written by Ichiei Ishibumi and illustrated by Miyama-Zero. The story centers on Issei Hyodo, a perverted high school student who is killed by his first date who is revealed to be a fallen angel. He is soon revived as a devil by Rias Gremory to serve her and her devil family.
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Koneko (с) Ichiei Ishibumi & Hiroji Mishima
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