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Culdcept Second Expansion or Culdcept II Expansion (カルドセプト セカンド エキスパンション) is either a sequel to or remake of Culdcept Second, developed by Omiya Soft and published by Sega for the PlayStation 2 in Japan in 2002.
NEC (via NEC InterChannel) released the game in the US as Culdcept. Whether or not Sega had any involvement at all is unknown.