Takeo Goda is a giant guy with a giant heart. Too bad the girls don't want him! (They want his good-looking best friend, Sunakawa.) Used to being on the sidelines, Takeo simply stands tall and accepts his fate. But one day when he saves a girl named Yamato from a harasser on the train, his (love!) life suddenly takes an incredible turn!

Every year, Sunakawa receives chocolates from a mysterious "Yukika Amami." When the mystery girl shows up in person, she tells Takeo how she has loved Sunakawa for over ten years, and Takeo decides to give her his support! With Takeo's help, Yukika gathers the courage to talk to Sunakawa… But how will he respond to her feelings?!