World Embryo

is a manga series by Daisuke Moriyama. It was serialized by Shōnen Gahosha in Young King OURs from 2005 to 2014 and collected in thirteen bound volumes. The series is licensed for an English language release in North America by 2009 from Dark Horse Comics, in Australia by Madman Entertainment, in Singapore by Chuang Yi, and in Russia by Comics Factory.

Plot
At the start of the series, high-schooler Riku Amami receives a cellphone picture from his dead step sister Amane with a hospital in the background. When he visits the said building, he is attacked by electromagnetic monsters called Kanshu, which travel and reproduce using cellphone signals: if a human hears his cellphone giving off an eerie static sound, his body is then gruesomely converted into a Kanshu or suffers irreversible infection. Riku is saved by two warriors, Rena and Youhei, who wield Jinki weapons designed to destroy Kanshu. During the battle, however, Riku finds a cocoon, out of which hatches a toddler looking exactly like Riku's dead step sister Amane. As the situation goes downhill, Riku ends up receiving his own Jinki and gets drawn into the shadowy organization that fights the Kanshu.