On a day as ordinary as any other, the Cutie Map assigns a new friendship mission to Twilight, who soon becomes concerned about the place it tells her to go.

She will need a lot of courage and willpower when she discovers that her now assigned mission is to reform one of her oldest and most terrifying enemies: King Sombra.

And as the task is carried out, the pieces of the puzzle of the past will begin to fit together and make sense, accompanied by new nascent feelings that no one could ever have believed possible.

[...]

When King Sombra accepts the princess' offer with malicious intentions, he will be surprised with different and unexpected obstacles that will not make things as easy as he thought they would be. Especially when the different attitudes and qualities of the princess in charge of him, instead of making him hate her, begin to create a peculiar feeling of curiosity within him.

However, when a sinister and seemingly powerful evil that is somehow linked to him is unleashed upon Equestria and the Crystal Empire, giving himself the opportunity to explore his feelings will not be an easy task.