You can usually find it by following the main questline and reaching the appropriate level. Check your quest log for specific instructions.
It might be possible to restore it to some extent, depending on the available resources and data.
Chapter 428, "Final Mission (9).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event.
Chapter 424, "Final Mission (5).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event. It opens with The entire group turned to look at Lucas as he finally defeated the...
Chapter 423, "Final Mission (4).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event. It opens with The battle against the Ghouls was reaching its climax, as ever since...
Chapter 425, "Final Mission (6).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event. It opens with The two entities that emerged from the rune that she had engraved on...
Chapter 427, "Final Mission (8).", is the clearest early answer because it turns Pale's situation into a concrete plot event.
Chapter 424, "Final Mission (5).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The entire group turned to look at Lucas as he finally defeated the...
Chapter 423, "Final Mission (4).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The battle against the Ghouls was reaching its climax, as ever since...
Chapter 425, "Final Mission (6).", is the clearest early answer because it turns Final Mission's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The two entities that emerged from the rune that she had engraved on...
Chapter 428, "Final Mission (9).", is the clearest early answer because it turns Beatrice's situation into a concrete plot event. A useful checkpoint is the way the scene starts with “Come on now Selene, that’s enough, there’s no need to roughen up the...