So... is Shion no Ou finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: March 23, 2008
Manga finished: April 25, 2008
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Shion no Ou follows the story of Shion Yasuoka, a young shogi prodigy navigating the competitive world of professional shogi after suffering a traumatic loss that left her unable to speak. She finds solace and support in her adoptive family and the shogi community.
Her exceptional talent draws the attention of Satoru Hani, a businessman who organizes a unique shogi tournament. This tournament becomes a catalyst for Shion's journey, forcing her to confront her past and the mysteries surrounding her family's tragedy.
As Shion participates in the tournament, she must overcome skilled opponents and uncover the truth behind the events that changed her life. The tournament and Satoru's involvement raise questions about his motives and the secrets he may be hiding, leading to a suspenseful search for justice and closure.
Ultimately, Shion must use her sharp mind and determination, honed through her shogi skills, to unravel the mysteries surrounding her past and find the strength to move forward.