I.O.N(イ·オ·ン) is a Japanese science fiction manga written and illustrated by Arina Tanemura. Originally serialized in Ribon from May to November 1997, the six chapters were collected and published in a single tankōbon volume by Shueisha in December 1997. The series was originally intended to be only three chapters, but Ribon had her lengthen it to six chapters. On October 22, 2010, an additional chapter of the manga was published in Ribon Fantasy Zokan Go Magazine.