Nisio Isin (Pronounced "NE-shi-oh OH-shin"; born 1981) is a Japanese writer. He was born in Kyoto. He still lives in Kyoto. He generally writes in the style of mystery and light novel. His writing is very popular among teenagers and 20-year-olds. His first published book was, "Kubikiri Saikuru". He won the Mefist Literature Prize for it in 2002. Koudansha Publishing is his primary publisher. The selling slogan for him is, "20 years old in Kyoto. NISIOISIN." He likes traveling and going to bookstores.