Mission 04: Learn how to use magic

Mission 4 for Kingdom Hearts 358/2 Days is a tutorial mission for Roxas's magical abilities.

Story Summary
Larxene takes Roxas on his fourth mission for Organization XIII, a training mission in Twilight Town's Sandlot that teaches him to use magic. We also learn of Larxene's sadistic nature and cruelty in a way that is worse than presented in that of Kingdom Hearts: Chain of Memories.

Mission Walkthrough
Before departing, you must equip Fire panels that Saïx will provide you with. This will likely be your first experience with the arrangement of panels, so it is also a good idea to equip all unused Potions. You should have three Fire panels equipped, plus any other that you may have obtained from previous missions.

Your mission takes place entirely in Twilight Town's Sandlot. Larxene will teach you how to use magic, instructing Roxas to kill the Dire Plant that appears with Fire. Once cast should wipe it out. A team of Yellow Operas and Dire Plants then appear. Larxene says that Roxas may use his Keyblade to eliminate these Heartless. User your remaining two Fire spells to eliminate the Dire Plants. Be sure not to hit a Yellow Opera instead, or you will have wasted a strong spell and will put yourself at risk with close combat with a Dire Plant. Also, during this battle, there are three Ethers on the Sandlot's edges. Be sure to pick these up, even if you don't use them. These items will restore a Fire spell if needed.

Video
Video walkthrough here.