Shion no Ō

Shion no Ō centers around a young junior-high school girl named Shion Yasuoka who had witnessed the murder of her parents as a small child. At the time of the murder, the killer takes the king piece from her father's shogi board (a Japanese strategy board game similar to chess). This leads her to believe that the murderer may be a shogi player. The shock of the tragic incident renders Shion unable to speak, forcing her to communicate by writing on a note pad. After being adopted by her neighbors, the Yasuoka family (where the husband is also a shogi player), Shion takes up the game herself, both for the love of the game and to possibly learn of the person who had killed her parents.

Shion Yasuoka (安岡 紫音, Yasuoka Shion)

Voiced by: Ayako Kawasumi[3]

Shion Yasuoka, formerly Shion Ishiwatari (石渡 紫音, Ishiwatari Shion) before adoption, is the main protagonist of the story. When she was five years old, Shion's parents were slaughtered in their own home, though the murderer was never found. Shion, being a young girl at the time, was traumatized by bearing witness to the aftermath and since then has been mute. To communicate, she writes down everything on a notepad. At the murder scene, Shion found a king shogi piece and later comes to suspect that the culprit plays the game.

When the story begins, Shion is thirteen and is in junior-high school. She loves sweets, though chocolate is her favorite. Due to her foster father's influence, Shion eventually starts to play shogi which she hopes will give her clues about the murder of her parents. Throughout the series, she only talks through internal monologue until the final episode where she regains her voice and is able to speak.

Makoto Hani (羽仁 真, Hani Makoto)

Voiced by: Hozumi Gōda[4]

Makoto is a professional shogi player and is referred to by many as Meijin (名人), the highest and most prestigious professional shogi rank in Japan (similar to a World Chess Champion). A keen and perceptive man who abandoned his brother after their mother's death to become a professional player himself. It is revealed near the end of the series that he is the one that killed Shion's parents, because he was interested in seeing what kind of professional Shogi player Shion would become, but this caused conflict with her father, who did not want his daughter to play professional Shogi. He was defeated in a match by Shion and arrested immediately afterwards, but not before remarking that Shion had the "eyes of a pro".

Satoru Hani (羽仁 悟, Hani Satoru)

Voiced by: Masaya Matsukaze[5]

Satoru is Makoto's younger brother and works as a businessman. Aside from that, he is also a gifted shogi player himself, who dreams to one day defeat his brother in an official match. His girlfriend was working with Shion's dead parents, and mysteriously died one day after them.

Ayumi Saitō (斉藤 歩, Saitō Ayumi)

Voiced by: Romi Park[6]

Ayumi is a fifteen-year-old male shogi player. Due to his sickly mother, he had to leave high school to take care of her and pay for her hospital bills. When playing shogi, he pretends to be a girl in order to earn money for competing; due to the male league taking two years to qualify. In the anime, after episode sixteen, he plays as a boy. Progressively through the series, he seems to care very much about Shion, saying that he wants to protect her. Many people often tease him about being Shion's boyfriend, causing him to become embarrassed. When he plays against Satoru, Meijin's younger brother, he reveals that his father was once a shogi player.

Saori Nikaidō (二階堂 沙織, Nikaidō Saori)

Voiced by: Risa Mizuno[7]

Saori is a female shogi player and apprentice to Makoto. She is eighteen years old, and a fan of Shion. As befitting the daughter of a high-class family, her type of shougi is usually dignified. She deeply seeks recognition from Makoto, who she looks up to.[8]

Shinji Yasuoka (安岡 信次, Yasuoka Shinji)

Voiced by: Yasunori Matsumoto[9]

Shinji is Shion's foster father and is a professional shogi player. His rank is 8 dan.

Sachiko Yasuoka (安岡 幸子, Yasuoka Sachiko)

Voiced by: Mariko Kouda}[9]

Sachiko is Shion's foster mother. A strict but caring woman who ever supports her daughter and husband, despite not always agreeing with them.

Osamu Kamizono (神園 修, Kamizono Osamu)

Voiced by: Ryusei Nakao[10]

A secluded 9-dan shogi player. Despite his grumpy exterior earning him the nickname "demon," Kamizono seems to have a kind spirit, as he not only accepted Ayumi as his apprentice, even after discovering his secret, but also lent some money to Shinji when he decided to adopt Shion. He's implied to place a great deal of value in family, refusing a disciple who abandoned his brother to learn from him but accepting one who would do anything to save his mother.

Tooru Hisatani (久谷 透, Hisatani Tooru)

Voiced by: Takahiro Matsukawa[11]

Tooru is Shinji's apprentice.

• Official website (in Japanese)
• Shion no Ō (manga) at Anime News Network's encyclopedia