Quote from Atlus:
Anyone who played the original Devil Summoner will find a much improved experience. Combat is deeper, control is tighter, demon negotiation adds to the challenge of growing your roster of demons, and an all-new mystery with multiple endings equals a vastly refined sequel. For series newcomers or RPG fans in general, nothing compares to the distinct edge and personality of a Shin Megami Tensei RPG, and Devil Summoner 2 offers everything necessary to serve as an excellent introduction to the universe. Hang onto those PS2s a little while longer, Faithful. You won't regret it.