Alien Nine (エイリアン9, Eirian Nain) is a Japanese manga series by Hitoshi Tomizawa, which was later adapted into an original video animation (OVA) series by J.C.Staff. The manga was serialized in Akita Shoten's Young Champion magazine, spanning 3 volumes. In 2003, Tomizawa released a 1-volume sequel to the series called Alien 9 Emulators. In 2015, Tomizawa also released a sequel doujinshi to Alien 9 and Alien 9 Emulators called Alien 9 Next. Both the manga and anime are noted for their moe art style contrasting the realistic art style seen in most seinen series at the time and heavy violence despite the young main characters, Pokémon-like monster designs, and initial appearances of a slice-of-life-esque series.