Successfully complete the indicated task to unlock the corresponding bonus:

Equipped Function Sn: Successfully complete the game on the Normal difficulty.
Equipped Function Zm: Successfully complete the game on the Normal difficulty with 100 or more ghosts captured.
Equipped Function In: Successfully complete the game on the Nightmare difficulty.
Equipped Function Fs: Successfully complete all missions with an "S" rank.
Rei Yukata (black): Successfully complete the game on the Normal difficulty.
Rei Yukata (red): Successfully complete the game two times on the Hard or Nightmare difficulty.
Rei Suit: Successfully complete the game on the Hard or three times on the Normal difficulty.
Rei Pinafore dress: Successfully complete the game on Nightmare difficulty or clear all missions.
Miku Yukata (blue): Successfully complete the game on the Normal difficulty.
Miku Yukata (pink): Successfully complete the game twice in Hard or Nightmare difficulty.
Miku Zero costume: Successfully complete the game on the Hard or three times on the Normal difficulty.
Miku Pinafore dress: Successfully complete the game on the Nightmare difficulty or clear all missions.
Kei Yukata (navy): Successfully complete the game on the Normal difficulty.
Kei Yukata (orange): Successfully complete the game twice on the Hard or Nightmare difficulty.
Rei Hair: Successfully complete the game on the Normal difficulty.
Rei Glasses: Successfully complete the game twice on the Hard or Nightmare difficulty.
Rei Cat Ears: Successfully complete the game on the Hard or three times on the Normal difficulty.
Rei Headband: Successfully complete the ghost list.
Miku Barrette: Successfully complete the game on the Normal difficulty.
Miku Glasses: Successfully complete the game twice on the Hard or Nightmare difficulty.
Miku Cat Ears: Successfully complete the game on the Hard or three times on the Normal difficulty.
Miku Headband: Successfully complete the ghost list.
Kei Browband: Successfully complete the game on the Normal difficulty.
Kei Glasses: Successfully complete the game twice on the Hard or Nightmare difficulty.
Kei Fox Ears: Successfully complete the game on the Hard or three times on the Normal difficulty.
Kei Glasses (white): Successfully complete the ghost list.
Ruri Ribbon: Successfully complete the game on the Normal difficulty.
Ruri Bell: Successfully complete the game on the Hard or three times on the Normal difficulty.
The Concept images: Successfully complete the game on the Normal difficulty with 50 or more ghosts captured.
Trailer images: Successfully complete the game on the Normal difficulty with 50 or more ghosts captured.
Trailer: Successfully complete the game on the Normal difficulty with 50 or more ghosts captured.
Upgraded Lens (Crush): Successfully complete the game on the Normal difficulty with 150 or more ghosts captured.
Upgraded Lens (Serial): Successfully complete all missions.
Upgraded Lens (Stop): Successfully complete the game on the Normal difficulty.