If you die in a night, you will aquire 9 lives. Pick an animatronic to select your mechanic. After 9 lives are fulfilled, you must head downwards to the bottom of the character selector, and listen to Tou-Gyou's story. When the once story is finished, your soul will return, emitting beautiful light, which will send you back to the night and activate characters that we're selected in the previous night you died.