Hint
Complete the Ghost List to unlock set-up information.

Hint
Win the game under the nightmare difficulty
setting to view the alternate ending and to unlock 2 more
alternate costumes/outfits(leather).

Complete all missions in mission mode to unlock the
maid costume/outfit and glasses for Mayu.

Completion bonuses
Win the game under the easy or normal difficulty
settings to view the 1st ending and unlock the "Mission Mode",
"Gallery", "Ghost List" options and the "Feel" and "Expand" camera
abilities. Additionally, a new game can be started with the current
items, maps, and camera abilities.

Hint
Complete all missions in mission mode with an "S" rank
to unlock 2 additional costumes.

Hint
Win the game under the normal difficulty setting
to also unlock the "Hard Mode" options, 2 alternate costumes/outfits
(red/blue kimono and dark blue kimono), and glasses for Mio.

Hint
Win the game under the hard difficulty setting to
view the alternate ending and unlock the "Nightmare Mode" and
"Album" options, the true ending sequence, and 2 more alternate
costumes/outfits(short kimono and Yae and Sae kimono).

Maid Costumes
Complete all Mission with any ranking to unlock the Maid Costumes.

All Outfits & Accessories
Win the game under normal difficulty to unlock Pink and blue yukata and dark blue and butterfly yukata and glasses for Mio

win the game under hard mode to unlock pink and green short yukata and sae and yae kimono

win the game under nightmare mode to unlock bondage (leather outfit)

win the game in mission mode with any rank to unlock Gothic Lolita (maid costume) and glasses for Mayu

win the game in mission mode with S rank or higher to unlock school uniform and Zero 1 heronie (inverted default)

All Outfits & Accessories
Win the game under normal difficulty to unlock Pink and blue yukata and dark blue and butterfly yukata and glasses for Mio

win the game under hard mode to unlock pink and green short yukata and sae and yae kimono

win the game under nightmare mode to unlock bondage (leather outfit)

win the game in mission mode with any rank to unlock Gothic Lolita (maid costume) and glasses for Mayu

win the game in mission mode with S rank or higher to unlock school uniform and Zero 1 heronie (inverted default)