Castle Gravenstein 1-6 parts

All parts of the game are about eight students - four guys and four girls who go to Gravenstein Castle - the most mysterious academy of sciences in the world. There, a relationship begins to emerge between them...

Secret unlock code scenes:
part 1 - blitz
Part 2 - glow
Part 3 - fire
Part 4 - xeno
Part 5 - blut
Part 6 - grav