Yoshiko Fujisawa, from Hokkaido, is the childhood friend of Hikaru Matsuyama. Serving as team manager at Furano Middle School, she consistently supports Matsuyama, her care extending beyond duty due to unspoken feelings. Matsuyama reciprocates privately, hindered by shyness. After Furano's loss to Nankatsu, her family moves to the United States. Departing, she gifts the team hachimaki headbands, Matsuyama's inscribed "I LOVE YOU - YOSHIKO". Discovering the message post-match, he chases her taxi to the airport where they confess mutual feelings, committing to a long-distance relationship. Months later, she returns to Japan ahead of her parents, reuniting with Matsuyama. Both attend Furano High School, continuing their relationship. During the World Youth Asian preliminaries, they communicate daily. Before Japan's quarter-final, she suffers a traffic accident, falling unconscious. Matsuyama stays at her hospital bedside, missing the match. She awakens during the second half, insisting he return to play. He rejoins in extra time wearing her hachimaki, contributing to Japan's victory; his earlier reduced physical exertion proves advantageous. Later, their relationship progresses to engagement during Golden-23. By Rising Sun, they plan marriage after university. She maintains friendship with Yayoi Aoba, romantically involved with Jun Misugi. After a J-League tie between Matsuyama's Consadole Sapporo and Misugi's FC Tokyo, Misugi acknowledges Matsuyama's abilities, reflecting her connection through both partners. Kind, diligent, and quiet, she embodies the "Yamato Nadeshiko" ideal. International adaptations rename her "María Fernanda" (or "Mafer") in Latin America and "Jenny" in Europe. Cultural details imply possible Christian practice through prayer habits resembling Christian customs, uncommon in Japan outside Nagasaki. Her surname "Fujisawa" combines "wisteria" (藤) and "marsh" (沢); her given name "Yoshiko" means "beautiful" (美) and "child" (子).