After the Fairy Tail guild helps around the town of Magnolia in preparation for Christmas, some of the members celebrate the holiday over at Lucy's apartment while the night is still young.
After Erza recruits Natsu to assist Mavis by allowing her to enjoy the qualities of a hot bath, Team Natsu and Juvia take up Warrod's request to look for a hidden treasure buried by the First Master herself 100 years ago, although the task becomes much harder than it was initially let on.
Due to the bet they made during the Grand Magic Games, the time has finally come for Team Fairy Tail A and B to decide who will have the privilege to make the other team do whatever they desire, leading to a day's worth of antics from the two parties.
During the Grand Magic Games, the Mages of Fairy Tail head to the popular resort known as Ryuzetsu Land, seeking to relax. While interacting with their friends and even members of other guilds, the crazy antics of Fairy Tail soon lead to trouble for everyone.
Mavis is seen sleeping on a tree branch in Tenrou Island, until she is woken up by an animal. She notices the silence and remembers how fun it was when the Tenrou Team was there. She then decides to pay them a visit. Later, Mavis wanders in Magnolia Town and smiles by herself as she knows that nobody can see her. She finally arrives at the guild's building, but just before she can enter it, the Fairy Tail members are getting out, prepared for a training on the beach and hot springs. Seeing that, Mavis decides to secretly follow them.
Natsu, Lucy, Gray, Erza and Happy are sent to the past by the mysterious Magic book, Memory Days. During their adventure, the group tries to avoid coming into contact with the people, afraid that they may affect the future. However, the group finds that their actions subsequently led to Natsu's scar and Lucy joining Fairy Tail.