Tairyou Jigoku, The

Successfully complete the game under the indicated difficulty and ending. Then, load your cleared saved game file to access the costume at the options menu.

Bunny Girl (black): Any difficulty with good ending.
Bunny Girl (peach): Any difficulty with good ending.
Bunny Girl (red): Any difficulty with good ending.
Maid (black): Hard difficulty with good ending.
Maid (peach): Hard difficulty with good ending.
Maid (red): Hard difficulty with good ending.

For the bad ending, get less than sixteen Usagi no Tegami; throw less than 49 enemies; and have a completion time more than three hours.

To get the normal ending, get less thatn sixteen Usagi no Tegami and throw more than 49 enemies. Alternately, collect at least sixteen Usagi no Tegami and throw less than 49 enemies.

To get the good ending, get over fifteen Usagi no Tegami and throw more than 50 enemies.