Misaki Hana grew up hearing her grandfather's story of the legendary flower—said to connect the hearts of people—and has loved flowers ever since. Returning to his town for high school, she transfers to Suzunomori Academy, which specializes in horticulture, and on her first day receives a mysterious seed from the school's striking directors. Her mission for the year: nurture the seed, grow her own flower of youth, and compete in the end-of-year Flower Show—while a year of school life, gardening, and gathering affection from the boys around her unfolds between April and March.