Editing Academy Secret Story (section)

==== Episode 1 "Tokino Hazama" - Epilogue ====
The ghost that appeared in the library was named Ellen. In the library is a very old book whose title has disappeared. When the torn seventh page of the book is opened, Ellen appears. Eren tells them that time has stopped since "that time" and that he is now in this place. He tells them that the Adventurer Academy holds a big secret, and asks them to go to a room in Glast Heim, before disappearing. 

She heads to Glast Heim with Lilia and Yuri. Lilia is excited and drags the reluctant Yuri along with her to Glast Heim. When they went to the room in Glast Heim that Eren had mentioned, they found a "stone" enshrined there. When Lilia picked up the stone, something like smoke erupted from it, and a horde of monsters she had never seen before appeared.

They were pushed into a dire situation, but as soon as they destroyed the "stone," the monsters vanished as if they had never been there. After returning to the Adventurer's Academy, the three of them - Lilia, Yuri and I - pondered while looking at the fragments of the "stone" we had brought back. Who made this stone that creates monsters, and why? Was it made by someone related to the Adventurer's Academy? Why is Eren frozen in time in the library? 

And this Adventurer's Academy. Eren said that there was a big secret, but if you think about it, when did this Adventurer's Academy start, who founded it, and where is it located? You realize that you don't even know that. There's so much I don't know about this adventurer academy... The three of them, including Lilia and Yuri, vow to uncover this secret.