No, you say? Then take a look at Project Cerberus. It’s a Naomi based arcade game with transforming heroes (think Super Sentai) that’s coming to PSP.
Milestone opened a teaser site for Project Cerberus, which notes the home version has a story mode. No screenshots, though, so here are videos of the arcade version.
Project Cerberus isn’t Milestone’s only fighting game. They also have Twinkle Queen for Wii, which features girls from various eroge series.