Son1x on 26 June 2009
What about Valkyrie Profile or Parasite Eve 4? Both series have 3 games (PE's third one is not yet released and its a spin-off).
Oh and Legend of Mana is not Seiken Densetsu 4, its actualy titled Seiken Densetsu: Legend of Mana. But Dawn of Mana is Seiken Densetsu 4 in Japan.