Happy joins Lucy Heartfilia on a Fairy Tail job to apprehend a mage responsible for casino destruction. During the search, he encounters Elie from Rave Master, who mistakes his feline form for a peculiar insect, sparking a brief confusion. Happy is drawn into the conflict when Klodoa, empowered by a Dark Bring, transforms into Jackpot Mark II and unleashes a horde of coin soldier minions upon the town. Utilizing his Aera magic for flight, he provides aerial support, battling the minions alongside allies from both Fairy Tail and Rave. Following Klodoa's defeat through their combined efforts, Happy departs with his Fairy Tail comrades as the groups separate.