Chihaya, Arata, and Taichi visit a Shiranami Karuta Society practice session. There they meet Dr. Harada, the society's director, and the oddball Hiro Kinashi, known as Retro (ひょろ, Hyoro), a sixth-grader like them. Chihaya, Arata, and Taichi play Retro and his friends in a three-on-three Genpei match. Taichi tells Arata he should just play alone against Retro and his friends, but Arata says he wants to play as a team...