Aruvu Rezuru: Kikaijikake no Yōseitachi

is a Japanese science fiction light novel series by Yū Yamaguchi that began serialization in 2011. It is released through the electronic magazine BOX-AiR, an imprint run by Kodansha Box. In December 2011, it was selected out of 11 winners of the New Author Awards to become the first BOX-AiR series to be animated. A short film adaptation (part of Anime Mirai 2013) by Zexcs debuted on March 2, 2013.

Plot
Set in 2022, technology has advanced to the point where the human nervous system can be seamlessly integrated into external networks thanks to nanomachines. People leave their bodies behind in water tanks while traversing through cyberspace. However, a crisis known as "Early Rapture" occurs where the system becomes overloaded, resulting in thousands of consciousnesses being lost in the network. Remu Mikage is on a personal search attempt for his sister Shiki's subconsciousness but happens to stumble upon her in her apartment, but happens to be somebody else who has somehow taken over her body.