Shion 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 not spoken one word. To communicate, she writes down everything via notes. 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 eleven (in the manga) 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.

Shion no Ou follows the story of Yasuoka Shion, a 13-year-old Shougi player with a past of tragedy. Shion's parents were brutally murdered in front of her when she was 5 years old. The murderer sat down with her and challenged her to a game of Shougi, after telling her that if she wanted to stay alive she should forget how to speak, and forget what happened that night. <br><br>
Now Shion has entered the realm of female pro Kishi, mute but strong. As her playing gathers more and more attention, so do the questions about her past and the brutal murder she witnessed. Shion's memories slowly come back, and the mystery begins to unravel, thread by thread. 

__Non-anime roles:__
- Shenhe - Genshin Impact (VG)
- Sugar - Goddess of Victory: Nikke (VG)
- Dikke - Reverse: 1999 (VG)

Yasuoka Shion lost her parents, and her voice, when she was young...in a murder.<br><br>
She was found amidst a blood-soaked room, and the only hint for the suspect was a Shougi board and one piece: the King. Now, Shion steps into the world of female professional Shougi players. As her popularity and fame slowly rises, so do the questions about her past, particularly the murder case that was never solved.

Shion Yasuoka