Bon Matsugorou no Bouken

Poor Mari, at the end of the winter break, her childhood friend whom she fell in love with just remember sending her a New Year Postcard to her. Moreover, instead of having a time of her own on the last day of the winter break, she has to help her mom sweeping her house. While she's holding a broom in a garden, she accidentally knock on her dad's Bonsai tree. Her mom scolded her and said that this tree is an inherited tree from Mari's great grandmother. Fearing that the tree will die from the fall, Mari waters the Bonsai and then she encounter somethings that even she couldn't believes herself at first.