Night is shrouded and moonlight falls on the ruins, a once bustling city that has been destroyed by war. In the midst of the ruins, a lone figure was quietly moving, it was Alan, a young man with special abilities. He is able to manipulate time for a short time, but this ability causes him endless trouble.
Eren weaves through the ruins, his target is Lucy, his childhood sweetheart, and his only friend in this world, but now she has fallen into the hands of the enemy. Eren decides to do whatever it takes to save her, but his abilities are not enough to deal with the immediate crisis.
In front of him, Lucy is guarded by a squad of enemy robots, whose firepower is extremely powerful. Eren knew that he could not defeat these robots on his own, but he did not give up and began to look for other ways.
Deep in the ruins, Eren discovers a broken time machine, and he realizes that this may be his only chance to save Lucy. He quickly repaired the machine and started it. The time machine takes Eren back in time, and he finds his young Lucy. In this time and space, Eren discovered an amazing fact, it turned out that Lucy's fate was already predetermined, she will never be able to leave this time and space, but will always live here to become the guardian of this world. At the same time, Eren also discovers a way to defeat the enemy.
Under Allen's persuasion, young Lucy begins to realize her fate. She decides to accept this fate and help Eren overcome her enemies. With Lucy's help, Eren finds a way to defeat the robot.
Back to reality, Allen and Lucy team up to successfully defeat the enemy. However, at the last moment of the battle, Lucy was seriously wounded. Alan watched in pain as Lucy gradually lost consciousness, and he knew that he had lost his only friend in this world.
Facing the ruins alone, Alan had grief in his heart, but he knew he had to keep going. Because Lucy's sacrifice made him understand his mission, and he wanted to complete this mission to the end. He avenges Lucy and brings peace to the world.
Eren finds the broken time machine in the ruins, he repairs it to perfection, and then he travels back in time to find his young self. In this time and space, he told his young self that there would be endless challenges in the future. But he's not alone. At GG, he still has Lucy, and their mission. Eren returns to reality, and he carries on with Lucy's last wish. He knows that there are still many things in this world that they need to protect, and he will continue to fight until peace is restored to the world.
In this dark world, Alan's figure fades away, his back appears firm and lonely in the moonlight, but also full of hope and strength. He knows that he will continue to fight until peace is restored to the world, until the day when he can reunite with Lucy.
