The forest of lost memories: A doctor named Hauser, just moved into the town. While he takes a walk in the town, he steps into the forest and then meets a girl, Luclei, in the sudden washing rain. Luclei catches a cold by walking in the rain. Hauser has been afraid of facing a patient from his memory of a girl he couldn’t save, but he regains his lost memory with the girl as he nurses Luclei...

[Edited from Steam]

A virtual reality adaptation of a short story from the "Innocent Forest" series written by Yomino Machiko. "Sora no Shindai" corresponds to the 7th episode published in the 2nd volume.