The protagonist, suffering from amnesia, gets caught up in a debate to find the Gnosia who has infiltrated the interstellar ship D.Q.O.
Yuuri is an original character who was created to represent the "player" character in the adaptation. Due to the option to choose a gender in the game, Yuuri's gender in the anime is unclear.
(Source: Official Site, translated)
Content compiled by AnimeList.moe from publicly available sources.
