Ajin: Semi-Humano (also known as Ajin: Demi-Human ) is a seminal seinen manga series that ran from 2012 to 2021. Originally written by Tsuina Miura for its first volume, the series was later spearheaded by artist Gamon Sakurai , who took over both writing and illustration duties from chapter six onward. This shift led to a narrative that is highly regarded for its tactical realism, psychological depth, and complex portrayal of immortality .