From MangaHelpers:
Suzu is the daughter of a family with a well-established tea house, and she has been raised to love and appreciate the brewing and tasting of Japanese green tea. One day, she helps out a woman who gives her a delicious kind of tea she's never tasted before. In search of finding this tea once again, Suzu heads out from her home on a tea journey, where she will encounter many new teas and tea makers.