Species (種（しゅ）, Shu) is the 8th chapter of the Kiseijuu manga series, written and illustrated by Hitoshi Iwaaki.
Becoming severely injured by Shinichi, Mr. A tries to escape and merge with Ryōko. Ryōko had other plans and kills Mr. A in an explosion. After things settle down, Ryōko is fired from her teaching position, for being pregnant and unmarried. Outside the school Shinichi has a talk with Ryōko and learns she plans to kill him. Though after learning that Shinichi and Migi are merging, she believes that it's better to let Shinichi live.