There are three difficulty options: Normal, Elite, and Expert.
On higher difficulties, Sayaka's death resets more data, and entering a dungeon resets her level to 1, creating a high-risk experience!

Normal	Sayaka retains all items, Eni, level, and weapon upgrades upon death.
Elite	Sayaka loses all items and Eni upon death.
Expert	Sayaka loses items, Eni, and weapon upgrades upon death. Her level resets to 1 upon entering any dungeon.