Update 6/27: It turns out reports that Astral Chain was planned to be the first game in a trilogy were caused by a mistranslation in an interview with game director Takahisa Taura. Taura clarified on Twitter that he said he is simply thinking about how Astral Chain could be expanded into a trilogy if the first game sells well, not that the first game is already planned to set up two more.
It’s a subtle but important distinction to make, as the implication of this game being only the first of three is that the story it tells might leave things hanging. Taura’s tweet did, however, reconfirm the initial reports that no additional content is planned for Astral Chain.
Source: IGN.com Update: Astral Chain NOT Planned As First Game in a Trilogy After All