Misa Amane's stalker

Ryotaro Sakajo (坂城 良太郎, Sakajō Ryōtarō) is a psychopath who is in love with Misa Amane. Although he is mentioned in the anime, manga, and films, he is only referred to by this name in the films, and otherwise remains nameless. He is the assistant director during the filming of Misa Amane's "Misa-Misa's Happy Sweets" video. He is obsessed with Misa, collecting a used tissue of hers after she throws it in the trash. In a sequence bridged between the two films, Sakajo corners Misa and brandishes a knife, stating that he wishes to die with her. Gelus, watching from the Shinigami realm, kills him to save Misa's life. In doing so, Gelus dies and his Death Note drops near Misa.

In the movie, Sakajo is first seen watching Misa film her cooking show, Misa-Misa's Happy Sweets. While off-set, Misa blows her nose, and throws the tissue into a small garbage can. After Misa has left, Sakajo takes the tissue out and places it into his pocket.

Sakajo presumably follows Misa outside after she leaves the TV station, eventually causing her to flee. Claiming that he wants to reunite Misa with her family, Sakashiro chases her with a knife and says that he wants "to die for her."

Gelus, who is watching over Misa, kills Sakajo with his Death Note. After his death, Misa finds Gelus' notebook and meets Rem.