Set in Katsunuma, Yamanashi Prefecture, heartland of grape cultivation, Okazaki Noriko, a high school senior and daughter of a grape farmer, reflects on her first encounter with Iwanaga Takeo, a star rugby player, three years ago in her family’s vineyard. Now, with her last summer vacation approaching, Noriko and her friends Kikuyo and Yuuko embark on a mission to confess their feelings to their crushes. Noriko, smitten with Iwanaga, who appears to be dating the school’s most beautiful girl, Nakayama Kyoko, gathers the courage to write him a love letter. In a twist of fate, she loses the letter, only to hear Iwanaga recite its exact words over the school announcement, revealing that their destinies are more intertwined than she ever imagined.