Disgaea 2: Cursed Memories/Episode 6: Coliseum

In the opening scenes of this chapter (or rather, the closing scenes of the last), Taro will join your team.

After clearing the first stage, you won't be able to return to Holt Village for a few episodes, so pick up any Treasure Chests lying around town before setting out. Between each battle, you'll still be able to access a base map with services like the Hospital or Item Worlder, but the map's geography and NPCs will be different.

Stage 6-1: First Battle
The weapons the "Invincible Hero" Samurai hold are one-of-a-kind, but they're all rank 1 and are pretty worthless stat-wise. Their names just sound cool, that's all. The Psycho Orbs and Kung-Fu Muscles would be much more valuable if you're looking for something to steal.

Most of the enemies here are equipped with weapons unsuited to their class, and all of the magicians' spells are Lv1, so they should be easy to defeat. The basic geography of theis stage doesn't leave much option for strategy, but anything should work if you keep defense in mind.