After fleeing without even fighting you and your army, Gong reappears. The Rain Miracle is required in this mission. If you don't have it he will tell you to go to Nyokiri Swamp to get it, and the mission will automatically fail. Once you get it, equip it and start. When you enter the mission you'll see your army as usual. March forward and you'll see a tombstone. Destroy it and you'll get the Don Drum, Drum of Miracles. It is bound to the X button of your PSP and makes a "Don" sound. The screen brightens, revealing Gong as the speaker. He continues with, PON PON PON PON PON PON PON PON PON-PON