Fluorette is the game's protagonist. Once she enters a shrine she refuses to leave, making it so the player has no choice but to explore the Spirit World with her. When Fluorette prays, her spirit leaves her body and allows her to exit through the door you came from (taking you to the Nexus outside). Once in the Spirit World she can collect and use different Prayers. Fluorette recalls her time in the Spirit World by means of a well within the shrine after returning from praying, saving the game.
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