Ruth discovers a Hello Kitty lunchbox washed up on the shore of her beach home. Within it lies a diary that expresses the hopes and dreams of a young girl. She suspects it might have arrived on a drift of debris from the 2011 tsunami. With every turn of the page, she is sucked deeper into an enchanting mystery.
In a small cafe in Tokyo, 16-year-old Nao Yasutani is navigating the challenges thrown up by modern life. In the face of cyberbullying, the mysteries of a 104-year-old Buddhist nun and great-grandmother, and the joy and heartbreak of family, Nao is trying to find her own place - and voice - through a diary she hopes will find a reader and friend who finally understands her.