Death Note Episode 12 Page

: Because Shinigami exist only to take life, using their power to extend a human's life results in their own immediate death.

Light "acts" as Kira for the police to lure Misa into a trap. Death Note Episode 12

A haunting flashback reveals the origin of this second Kira's power. It centers on , a Shinigami who committed the ultimate taboo: falling in love with a human woman named Misa Amane. : Because Shinigami exist only to take life,