Goemon Ishikawa XIII is offered a large sum of money by a shady businessman to kill the king of an old European country. While Fujiko is posing as the tutor to the king's three children, she takes note of the various treasures that are being loaded on to a train headed for home. The king, the children and Fujiko all board the same train, but accidentally run into Goemon. The kids take a liking to Goemon, calling him their "Samurai Friend." But Goemon seems stone-faced throughout the episode.
Later on, after finding himself unable to kill the king with children around, one of the Count's men sabotages the train and makes it unable to stop or slow down. Goemon decides to come clean with the king, saying that he was sent to kill him but instead wishes to save him from the man who hired him. The king pushes Fujiko and his children into a safe compartment, giving them his belt to help fasten them in, then Goemon separates the runaway cars, saving the people while the other train cars carrying the artwork tumble off a cliff and explode.
While the king deals with the Count who hired Goemon to assassinate him, Goemon himself catches Fujiko as she prepares to flee the scene with the king's rare belt. However, Fujiko plants a kiss on him before disappearing into the night with nothing but the belt on her. Goemon finds himself frozen in place, wondering if he just got a "real girlfriend."