Ys: Tower of Horror (イース 戦慄の魔塔, Īsu Senritsu no Ma-tō ) is a "choose your own adventure" style gamebook based on the video game Ys I: Ancient Ys Vanished: Omen, written by Nobuyuki Shioda and Mitsutaka Oide, and published by Futabasha in 1988 in Japan.
Plot[]
Hiroyuki, a boy from modern Japan, finds his consciousness inhabiting the body of Adol Christin, an adventurer from another world. In a strange two-person relationship with Adol, who has lost control of his body, Hiroyuki takes on the challenge of solving the mysteries of the "cursed island", Esteria.