Kip. 3: Memory Days

3

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. (Source: Fairy Tail Wikia)