This is a fairy-tale type novel game in two parts, each part written independently -- one by Yuki, the other by Ritsu.

The Caged Vagrant -Yuki's story- (branching)
The story of an amnesiac who slowly comes to reconstruct the world through conversations with a very strange and special friend.

Plumerai -Ritsu's story- (linear)
The Plumerai, which stretches out from the sky like some gargantuan hand. And the countless number of birds who attack this cloud...