|Kanji Name||笹川 京子|
|Romaji Name||Sasagawa Kyōko|
|Date of Birth||March 4|
|Associated Famiglia||Vongola Famiglia|
|Family||Ryohei Sasagawa (Brother)|
|Manga Debut||Chapter 1|
|Anime Debut||Episode 1|
Kyoko Sasagawa (笹川 京子, Sasagawa Kyoko) is the girl that Tsuna admires and has a crush on. She attends the same school as Tsuna, Namimori Middle School. She is the younger sister of the Vongola Sun Guardian, Ryohei Sasagawa. Kyoko is somewhat carefree, not questioning the idea of an infant being in the Mafia. Her personality is more quiet and polite, and not much is known about her true feelings for Tsuna; however, she obviously views him as a close friend. She dislikes fighting and is always worried for Ryohei after he suffered an injury protecting her, from a rival who used her as bait for a fight, during their childhood. She is generally portrayed as a kind and caring character.
In the beginning, Kyoko is Tsuna's only reason for coming to school. From her very first appearance, she is established as an off-kilter character; her first line is an inquiry, to her friend, expressing surprise over the fact that an unnamed topic of discussion was considered 'weird.' When she is named as 'prize' by her Mochida when he challenges Tsuna to a duel, she attempts to lunge for him, but her friends hold her back. During the Daily Life Arc, she proceeds to participate in many of Tsuna's wild antics. She has, as of this point in the story, been shot by the Dying Will Bullet twice: the first one was when she played Russian Roulette and the second one was when she ate one of I-Pin's Gyoza Buns, falling unconscious and being shot by Reborn to be saved.
Kyoko was not involved in any of the fighting. She does appear during the List Countdown when Ryohei is attacked by Ken. She buys the story that he climbed the chimney to the bathhouse and received a "sprain" when he fell. She also believes Ryohei when he explains to her that the gauze, his broken arm, and missing teeth are all just part of the "sprain."
Kyoko appears once again during this Arc. At the end of Tsuna's flashback due to the Criticism Shot, he hears her being reassured by Ryohei that Tsuna will come back, so she agrees and states she had total faith in him.
Kyoko accepts Ryohei's story that he, along with the rest of Tsuna's Guardians (though he doesn't use that term), are just participating in a series of sumo-wrestling matches over the course of the next seven nights. She doesn't like it, but she accepts his reasons for coming home so badly beaten. She also takes care of Lambo with Haru and Nana after Lambo is badly beaten in the Lightning Ring Battle. Before the Sky Ring Battle, Kyoko gives Tsuna a handmade charm and wishes him good luck for the sumo-wrestling match.Millefiore. An attack made by Nosaru and Tazaru of the Millefiore makes her fall to a nearby warehouse. The younger Tsuna stumbles in however, Kyoko calling him "Tsu-kun", but before Tsuna can do anything, Kyoko is replaced by her younger self by the Ten-Year Bazooka. She witnesses Tsuna transform into his Hyper Dying Will Mode and witnesses him get hurt; however, Tsuna utilizes his Zero Point Breakthrough to defeat Tazaru. She is escorted back to the Vongola Base along with the younger Haru, Lambo, I-Pin, and Yamamoto by Gokudera and others. Later, concerned for her friends and family and feeling trapped inside of the base, she locates an unobserved exit and finds her way into the city, successfully avoiding capture by the Millefiore and taking shelter with Hana until Tsuna comes to find her. Kyoko and Haru volunteer to do the housework while Tsuna and his friends train. Kyoko and most of the other non-fighting characters stay behind in the invasion.
In the week leading up to the Choice game, Kyoko and Haru demand Tsuna that he tell them everything about the Mafia, Byakuran, and the Millefiore. While Bianchi, Fuuta, Giannini, I-Pin, Chrome, and Reborn support them, Tsuna refuses to admit to them that there was anything worth knowing; as a result, Kyoko and Haru go on strike by refusing to do any housework while being kept in the dark.
She eventually recants, and on her way to buy groceries to cook food for everyone, she is stopped by Tsuna (who was misled by Bianchi to believe she had run away again). Tsuna realizes on the way to stop her that there is a difference from being kept completely in the dark and knowing there is something that others are refusing to tell a person; so, he sits her down and tells her everything. She is then able to offer her opinion as to why Tsuna's Sky Vongola Box was being temperamental, which gives Tsuna a clue on how he needs to open the Box Weapon correctly.
During the first Choice battle, she and everyone (except the participants) were watching the fights from the audience stalls.
She appeared along with Haru, I-Pin, and Bianchi went to Kokuyo Land to deliver a bento for Chrome. However; when they arrived, Ken and Chikusa told them that she disappeared since the day they returned from the future. Later, she, along with Haru, Lambo, and I-Pin, were almost hit by a missile launched by Skull, but was saved by Hibari's hedgehog. Afterwards, she told Tsuna that Chrome hadn't come back and wanted to consult him about it.
In this arc, Kyoko doesn't have quite as big as a role as she did in the Future Arc. She made a small cameo with Haru in a cake shop in chapter 301, smiling. Tsuna and his Guardians, at the time, were preparing to face off against the Simon Famiglia. Before leaving, Tsuna gave the girls a silent goodbye and then runs off. At this, Kyoko lets out a small 'Oh?' and Haru asked her what was wrong. She replied that she got a 'warm feeling', meaning that she didn't know about the goodbye that Tsuna left her. After one week has passed, Kyoko comes to school to see her brother, Ryohei, in a net due to Adelheid's punishment for him breaking the rules; she was worried about Ryohei because of his injuries from a supposed "shooting star", afraid of him reopening his wounds, much to Tsuna's disbelief at the obvious lie Ryohei gave her.
Kyoko arrives and greets Tsuna and his representative members, causing Tsuna to question her presence. Kyoko explains that Chrome wasn't at school that day, and that she found Chrome feeling unwell in her apartment and took her to the hospital for a checkup. Kyoko then reveals that the analysis stated that her internal organs were gone. Tsuna recalls that that once happened in the future. Kyoko tells Tsuna that despite her grave condition, Chrome seemed to want to talk to him, always calling out for "Boss."
- In the Card Games, Kyoko is shown to have a Mist Flame; however, this has not been confirmed by the creator of the series.
- Kyoko was held as bait by an older kid who wanted to fight Ryohei in the past, which was how Ryohei acquired the scar on his eyebrow.
- She is the most popular girl at Namimori Middle School.
- When she was a kid, her dream was to be a ballerina. She wants to become the prima and dance in Swan Lake in France. She also said that if her dream doesn't come true, she'll become a police officer and catch bad guys.
- Ryohei states that to this day, Kyoko thinks boxing is two guys fighting in their underwear with oven mittens on.
- Akira Amano stated that Kyoko had long hair before preschool.
- In the manga, she was shot by the Dying Will Bullet on two different occasions.
- As stated by Tsuna's father, Iemitsu, Nana was similar to Kyoko when she was young.
- Character Songs Featured In: