Euphorion

is a Japanese light novel series written by Mie Takase, with illustrations by Mikisato. The series began publication on December 10, 2002 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Sora sound of being bullied meets a girl who is as beautiful as a doll. The girl, who called her Migiwa, laughed mysteriously, "Why don't she die?" A new drug called Euphorion kills a person and revives a few hours later. Sora, who took medicine, saw a mysterious sight. From that day on, the heart of Sora will change little by little. There is nothing scary about the sound of the sky that saw the world after death. However, one day I can no longer contact Migiwa. Then, a person named Migiwa's older sister appeared. Migiwa stole a large amount of Euphorion and disappeared. Due to the mysterious new drug Euphorion, Sora is involved in the incident ...