On New Year's Eve, Phoenix Wright and Maya Fey, along with Gumshoe and the judge, are invited by Avery Richman to ride the maiden voyage of the Silver Star express train. During the voyage, Gumshoe spots a strange soul outside before Richman, a fugitive who was sentenced to death, takes over the train with his staff. Believing that he was wrongly declared guilty in an American court, Richman reveals he had invited all the witnesses to that case in order to hold a fair retrial, with Phoenix as his defense and Tristan Turnbull as the prosecutor. Gumshoe attempts to rescue them, only to discover the dining car that everyone is in has seemingly vanished from the train.
(Source: Crunchyroll)
— Description from AniList community (anilist.co).
