Now you know why it wasn't released first. *This was Narutimate Portable 1 in Japan. *In the US they didn't think people would like it, so they took Ultimate Ninja 2 and took out a few characters and levels so it could fit on the PSP UMD and they called it Ultimate Ninja Heroes. *Go figure.
This game should have been first, but it is a little bit changed from the japanese one. Rasengan/Chidori was added(you can use it as an up up/down down* circle move, instead of ultimate),and the combos were changed. Also Mujengo may suck lol, but atleast they added a story and mini-games this time.