There's been an ongoing case of people missing and turning dead once they've been found. When their bodies were examined, there were no signs of struggle, it's like they had simply dropped and died. As you investiguete the places the bodies had been found, you start hearing someone singing. You feel mesmerized by it and go investigate the source. A transparent looking girl is singing all by herself, not quite a ghost, but she look more like... a sea-angel? You can't help but get closer.

La~ Lala~ Lala~

The girl takes notice of your approach and turn to you.

Oh, hello there~ Are you here to listen the song of little ol' me?