Forum:Story Mode in P4A and P4AU

Hello Everybody

I am starting to discover these magnificent games and, as is already a cliché, I started with Persona Games. I played Persona 3 Portable and Persona 4 Golden. And for the next step, I was thinking of playing the Arena Games. But I don't know wich one to buy, if Persona 4 Arena or Persona 4 Arena Ultimax. So my doubt is if the Story Mode in Persona 4 Arena is also available in the Ultimax game or, in other to see the complete story I will need to buy both games.