Disgaea 2: Cursed Memories/Episode 5: The Promise

In the opening cutscenes, Hanako will force her way into your group. When she first appears, her level is 12, and she carries a Wolf's Fang (Red), Leather Jacket (Armor), and Psycho Orb (Orb). Since Hanako doesn't use much SP, you may want to give the orb to another character.

Stage 5-1: Glutton's Hideout
Geo Symbols - Blue Panels only
 * Blue Symbol "Encroach" on blue panels
 * Blue Symbol "Heal 20%" on blue panels
 * Blue Symbol "Enemy Boost +50%" on blue panels

This stage is much easier than it looks, and there's no real "trick" for victory. Several enemies (most notably the Boggarts) won't move in to attack, they'll just stay put until they can strike you from their current standing position. As long as you advance slowly, keep your fighters in the front and your mages in the back, and have at least one healing unit, victory should be assured.

After you've taken care of the Boggarts and Petite Orcs on the front lines, you should focus all your efforts on removing the "Enemy Boost +50%" Geo Symbol. Tower-throw a character towards it if you need to. As long as that's out of the way, the ever-expanding "Heal 20%" geo panels aren't a significant threat, as they benefit both you and your foes.

Of the remaining enemies, the two Alraunes will most likely approach first, because of their comparatively long attack range. Be prepared to defend against their Green Needle move, and attack them with physical attacks instead of spells. The remaining Empusas and Head Orc shouldn't be too difficult, as long as you gang up on each one and don't give them time to heal.