Simple 2500 Exorsister for PSP got leaked. This is the game that's very similar to Oneechanbara. You pick from one of four girls and go around killing monsters. The game at least plays a lot smoother than Oneechanbara ever did, and the monsters aren't as brain dead like Oneechanbara's zombies are, but it's still pretty basic. One attack button, projectile shot, jump/dodge, and auto-target. You have to charge up with the R button to suck the remaining life force out of monsters once you get them knocked down; doing this also nets you more energy for your projectiles. Wouldn't buy it, but I'll play a little bit more and see if it's worth keeping on the memory stick...it's under 300MB anyway.
EDIT: Considering it's a budget release, this is not a bad game. It's not terribly difficult thus far, but also not just mindlessly easy like Oneechanbara. The enemies actually follow and attack you. There's five maps total, each broken down into smaller missions, where you start at one part of the map, move through killing monsters, and find and kill a target enemy to end the stage. You can earn gold and use that to unlock better weapons and armor. The four girls carry different types of weaponry; there's a katana type, an axe type, a bazooka type, and an uzi type, although the range of the guns is pretty limited. Pretty basic stuff, but decent for what it is.
