You have been in a world where you can see various creatures with your own eyes.You were one of them. One day you were promoted and assigned to be someone's guardian angel.Until the very end, you did not know who would be given to you under your care. On your first day, you move to the location towards your goal.You are greeted by a bright room organized as a laboratory, in which your gaze falls on the only figure there. "Uugh..How many times have I told you to knock on my door.."