(Airi4 Airi x Mizu5 Ena)

You, Airi, found a peach colored key. You thought it was useless, that you couldn't open anything with it. You used a train to go to your house, the moment you arrived, you saw a strange white door that looked that it will lead you to nowhere, you decided to approach it, using the peachy key to unlock it, fortunately, you could open the door. Inside, there was a all white world, with the floor covered in water that covered your foot. The door closed all of a sudden, causing you to gasp, with no other thing to do, you walked further onto it.

A girl was lying on the water, holding a ribbon close to her, her gaze showing a dispair and sorrow that words couldn't describe, she looked guilty, concerned and miserable. You walked to her.