More than 400 years ago, in X777, Lyle was a knight who protected Queen Irene.

In this era, dragons held absolute dominance and posed a serious threat to human survival.

Lyle awakens a future simulator. After simulating his future with Eileen, he discovers that he will die to protect her, while Eileen, due to a political marriage and prejudice, ultimately meets a tragic end.

The simulation ended, and Lyle received the "Dragon's Blessing," which has a threatening effect (the blessing can only be obtained in the first simulation with the same target).

Lyle decides to change his and Irene's fate, to change Belserion's fate of dying in battle, to change Kyoka and Sera's fate of blindly pursuing killing, to change Mavis and Zera's fate of painful separation, and to change the fate of many more Fairy Tail characters over the past 400 years...