Momo is a young girl who lived in a bustling city before losing her father. She then had to relocate with her mother to their old family home on a remote island where time seemed to stand still. The surroundings were characterized by ancient wooden structures, sacred shrines surrounded by trees, and fields meticulously carved out from the steep hillsides. There was no shopping mall in sight. Momo wasn't thrilled about this new environment, particularly since her father had left an unfinished letter that read "Dear Momo..." which left her wondering what he would have said next.
One day while exploring the attic of her new home, Momo stumbled upon a dusty and worn-out book. From that moment on, something truly extraordinary began to unfold around her.