Second Evolution picks up roughly 20 years following the events of First Departure. Claude Kenny, the son of Ronyx Kenny from the previous title, finds himself transported to the Planet Expel by accident, where he saves a girl named Rena Lanford and is hailed by the locals as the promised hero of ancient legend. On an interesting note, you can actually choose to play through the game as either Claude or Rena, and the choice you make will affect which characters you can recruit and how things will ultimately play out.
Either way, though, the two of them, as well as the other characters met along the way, will (after a seemingly endless introductory sequence filled with far too much dialogue and not nearly enough gameplay) eventually set off to investigate a meteorite that had crashed into the world's surface a few months ago. This meteorite has been blamed for the appearance of monsters, as well as an increase in the frequency and magnitude of natural disasters, but in typical RPG fashion, something far more sinister awaits them on their journey. On the whole, the story isn't quite as gripping or as personal-feeling as First Departure's, but it is passable nonetheless.
The game's translation has been altered considerably from the original PS1 version of the game, and the new localization has been the subject of much debate among longtime fans of the series. Some argue that the new English language text is more grammatically correct and closer to the tone of the original Japanese script, while others counter that Square Enix made several unnecessary changes, some of which were for the worst (especially when it comes to the names of Ashton's dragons). Personally, while I can understand the need for some of the changes, I still prefer the original translation, even with all its flaws and mispronunciations.