Description:

The protagonist is a girl with the ability to visit a surreal alternate dimension full of monsters in her dreams. One day, she meets another human girl there around her own age and receives a plea for help.(Source: MU)

Description:

A world stretching down from the heavens: the Vertical World. There lives a boy named Ruska, who finds himself fascinated by the world below. One day he sees a girl falling from the sky above, straight towards the bottom... And so begins his adventure surrounding the mystery of the Fallen Maiden!(Source: MangaPlus)