The game's protagonist travels between various parallel worlds in order to solve the mystery of his parents' disappearance. Although parallel worlds are not an unfamiliar concept in science fiction, the game uses concepts from physics, mathematics, philosophy, history and religion to construct a unique fictional universe. In particular, the "A.D.M.S." or "Auto Diverge Mapping System," which visually displays the branching parallel worlds/storylines as a tree, aids the player in navigation. The game also includes references to cannibalism and incest.
A NEC PC-9801 edition, Sega Saturn edition and Microsoft Windows edition were released. All versions are rated 18+, although explicit sex scenes were removed from the Saturn and Windows editions. A hentai anime OVA as well as a manga and several novels were later released. A remake developed by 5pb was announced in December 2014 and after several delays was released on PlayStation Vita and PlayStation 4 in March 2017.
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This game also exists on:
Sega Saturn
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