Born 1981. In 2002, NISIOISIN’s novel The Beheading Cycle won the 23rd Mephisto Prize and became his debut publication. Among his numerous novels are the Zaregoto series, the Monogatari series, the Densetsu series, and the Bōkyaku Tantei series. He also wrote the manga tie-in novel Death Note: Another Note. As a manga writer, he has appeared in the Weekly Shonen Jump magazine with his series Medaka Box—also collected in a 22-volume set—and his Ōgiri series of one-shot manga stories have seen the pages of Weekly Shonen Jump, Jump Square, Weekly Young Jump, and Bessatsu Margaret.