What was a fearsome dragon, now sleeps in a human body. In the attempt to remember his forgotten past, Sleeping Dragon created the Gallery of Lost Memories, a oniric castle where he gathered recovered memories. In the center of this, Hiru, a boy with a strange connection with the dragon, and his companion Clockbirdy, a cuckoo, explores the castle and unravel the past of Sleeping Dragon.

What was a fearsome dragon, now sleeps in a human body. In the attempt to remember his forgotten past, Sleeping Dragon created the Gallery of Lost Memories, a oniric castle where he gathered recovered memories. In the center of this, Hiru, a boy with a strange connection with the dragon, and his companion Clockbirdy, a cuckoo, explores the castle and unravel the past of Sleeping Dragon.