Grandia: Parallel Trippers

This is a Game Boy spin-off from the original Grandia game on Saturn and Playstation. It tells the tale of three school children named Yuuhi, Mizuki and Shirou who get sucked into the world of Grandia. In the course of the game you meet the cast of the original Grandia game like Justin, Feena, Sue etc. Though the characters from Grandia appear in it, it is not a continuation of the Grandia storyline.