After accepting a request to transport some gold for a client, Lucy, Natsu, Happy, Wendy and Carla travel on a six hour train ride while guarding it. Natsu is met by a group of three man with large buttocks who have, unbeknownst to them, knocked out the conductor and are planning to steal the gold the group is transporting. Soon after the gang uses the Gas Butt Triple Ecstasy to smell out the carriage, causing Lucy, Happy and Carla to fly out. They invite Wendy into their team, to which she accepts. However, Wendy has an alternative motive for joining.
Moments later Lucy, Carla and Happy angrily return to the train. Before Lucy and Carla get a chance to attack, Happy wakes Natsu up, and notifies him about the current situation. Natsu, after realizing that he had been tricked, and Happy jump from the open train window to the roof of the train. Wendy tries to stop Natsu, telling him that the Jiggle Butt Gang will turn over a new leaf. Natsu, however, walks towards the bandits ignoring Wendy's words. Seconds later, Natsu runs towards them and attacks them with Fire Dragon's Iron Fist, sending them flying off the train's roof.
With the gang finally taken care of, the group continues their journey and eventually reach the station where their client waits. Meanwhile, out on the train tracks, the members of the Jiggle Butt Gang pump a hand-operated rail cart and vow that they will one day master true evil.