Hello! Sandybell is the story of a girl who lives in Scotland with her father. She spends her time playing with her faithful dog (Oliver) and her friends. One day she meets the Countess of Wellington, a kind-hearted woman living in the castle near their village. She also meets Kitty, an arrogant young lady who lives in the large mansion outside their village.
Kitty hates Sandybell and continues to visit the Countess in the hope of winning the love and interest of her son, Marc, who falls in love with Sandybell. The Countess gives Sandybell a white lily and she plants it outside the village. She also brings other flowers and plants them around the lily, making a small garden of flowers around it. Sandybell treasures the lily because it reminds her of her deceased mother.
Sandybell's goal throughout the series is to find her mother someday. In the final episodes, they finally reunite. However, upon their meeting Sandybell finds that her mother suffers from amnesia, and Sandybell fails to convince her that she was her daughter. Later, when a young child falls into the water and Sandy saves his life, flashbacks strike her mother and she remembers the past.