Tsukuru Mishima is recruited by Soichiro Yagami to serve as leader of the Death Note task force that is created in response to a surge of killings by new Death Note users. In 2015, Mishima kills Mikami in order to claim the notebook Light entrusted to his son, Hikari. From then on, Mishima acts as the new Kira, intending to surpass Light and establish world peace. In order to hide his identity, he passes the notebook to cyber-terrorist Yuki Shien and loses his memories of being Kira. When Mishima meets Shien in 2016, he touches the notebook he gave to Shien and regains his memories. After being imprisoned for his crimes, Mishima is freed from confinement by a dying Ryuzaki, who appoints a remorseful Mishima as his successor. His real name is Ryo Nakagami (中上亮 Nakagami Ryo).