Watch the opening.
Clear the bronze cup at the battle arena.
Clear the silver cup at the battle arena.
Clear the Gold cup at the battle arena.
Clear the Maid Cup at the battle arena.
Beat 100+ levels in the training accelerator.
Earn the "Watchers from Above" ending.
Earn the "Sole Follower" ending.
Earn the "Together" ending.
Earn the "Memories" ending.
Earn the "To the Future" ending.
Earn the "I'll Stand by You" ending.
Earn the "The Great Escape" ending.
Earn the "Indefinite Post" ending.
Earn the "Open for Business" ending.
Clear all subquests.
Learn all magic and skills.