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Ys Book I & II (イースI・II Īsu Wan Tsū) is a Japanese action role-playing game compilation consisting of enhanced remakes of the first two Ys games, released for the CD-ROM² by Nihon Falcom and Hudson Soft in 1989. It was released as Ys Book I & II for the TurboGrafx-CD in North America in 1990, and was a pack-in title for the TurboDuo in 1992.
Ys I & II consists of enhanced remakes of the first two games released in the Ys series, Ys I: Ancient Ys Vanished and Ys II: Ancient Ys Vanished – The Final Chapter. It was one of the first video games to use CD-ROM, which was utilized to provide enhanced graphics, animated cut-scenes, a Red Book CD audio soundtrack, and voice acting. The game's English localization was also one of the first to use voice dubbing.
It was the second role-playing game released on the CD-ROM format, six months after Tengai Makyou: Ziria (Far East of Eden). Ys I & II was also the first action RPG released on CD-ROM, and the first CD-ROM based RPG released in North America. The game was critically acclaimed upon release for being one of the first games to effectively demonstrate the potential of the CD-ROM format, including a lengthy adventure, animated cut scenes, Red Book music, and voiced dialogues.
The game's early Red Book audio soundtrack was composed by Yuzo Koshiro and Mieko Ishikawa and arranged by Ryo Yonemitsu. As one of the first CD soundtracks in a video game, the music and audio have been critically acclaimed since its 1989 release.