Kyoko has a good relationship with her brother, where she is shown to greatly admired him for his strength and devotion to being extreme. Ryohei Sasagawa is the older brother of Kyoko, only around a year older than her.
In the Japanese, the future counterpart of Kyoko refers to him as "Tsu-kun", previously a nickname only used by his mother, though an explanation on why was never given. While Kyoko does view Tsuna as a good friend, it remains unknown as to whether ot not she harbored any romantic feelings for him. After realizing how hard Tsuna and the others were working to protect them they ended the strike, and Tsuna eventually explained the mafia to her. Kyoko felt left out and concerned, and joined in Haru Miura in going on strike, refusing to cook and clean until they were informed about everything that was kept secret. Kyoko was impressed by Tsuna defeating Kensuke and said that he "wasn't an ordinary person", starting off the events of their friendship.Īs time passes, Kyoko had become really close friends with Tsuna, as they bonded together during many events and antics throughout their daily life. Their friendship was somewhat strained while trapped in the future, as Tsuna continiously refused to explain to her Millefiore Famiglia, or the Mafia to her.
After Kensuke Mochida is defeated in the kendo match, Kyoko apologizes for previously running away and believing that his confession was merely a joke. Their first interaction together is when Tsuna enters Dying Will Mode and confesses his feelings to Kyoko, causing her to run away in fear. When Kyoko first met Tsunayoshi Sawada, she was said to be the only girl to have ever spoken to him, the two were acquaintaces, and Tsuna admired her from a distance.