A story about a girl with little ambition who gradually matures as a woman through a Japanese card game competition that she unwillingly participated. Koi, who dreams of a quiet and modest life, ends up entering a poem card competition, Hyakunin Isshu, where she becomes the focus of attention against her wish with her winning streak. The drama revolves around the competition and her first romance toward Yura, a masterless samurai who tries to use Koi to revenge for his father.