Talk to Prinny which lies at the foot of your secret base 10 times in quick succession to access the store costumes.
Keeping Etna
Released at the same time as the costume shop (speak to Prinny which lies at the foot of your secret base 10 times quickly).
Keeping Flonne
Released at the same time as the costume shop (speak to Prinny which lies at the foot of your secret base 10 times quickly).
Keeping Laharl
Released at the same time as the costume shop (speak to Prinny which lies at the foot of your secret base 10 times quickly).
Held Abroad
Complete the game once and watch the ending sequence.
Keeping Dangerama
After completing the game, attack Darkdeath 3 times and watch the ending sequence.
Keeping Boogiepop
Complete the dungeon floor 10F Dengeki "Boogiepop Phantom".
Keeping Firo
Firo beat on the floor of the dungeon 10F Dengeki "Baccano!".
Keeping Index
Spanking Index on the lower floor of the dungeon Dengeki "A Certain Magic Index.
Keeping Taiga Aisaka
Aisaka Taiga beating on the floor of the dungeon 10F Dengeki "Toradora!".
