Mavis is bored staying alone on Tenrou Island, so she decides to pay the guild a visit, unaware that the Fairy Tail members are going to the beach for a training camp, for which she decides to tag along as well. The group faces a lot of trouble that is caused by Natsu and Gray. That night, the guys get more than they bargained for when the girls get drunk. In response, they come up with a devious plan soon after.