Jack is given her brother's journal that tell of his fantastic journey across an unfamiliar world.

Before the Celestial Sisters, before even the Tree of Harmony, there were the Guardians

An earth pony wakes up knowing nothing of himself or where he is. He'll have to piece together his life, bit by tiny bit.

The guilt from her past keeps Celestia awake once again.

The joy in love comes from the journey it takes to get there. Sometimes, that journey is started unwittingly.