|School:||Hakusanura Elementary School|
|Grade:||1st year middle school (Shinohayu)|
|Debut:||Shinohayu the Dawn of Age ch 23|
Sayuna Hoshino is the winner of the Niigata elementary tournament during her 6th year at Hakusanura Elementary School.
Sayuna has green hair in a bob style and purple eyes. She is rather tall for her age.
Sayuna is a girl who likes to take it easy and avoid any kind of "trouble". She considers anything that takes to long a pain but is willing to leave things to fate.
Playing Style / Abilities
Children's National Tournament Arc
Sayuna starts off the fourth round match strong by winning the first round bonus hand off of Shino Shiratsuki. Kokoro Oroku notices the girl sighs a lot and asks her why. Sayuna tells her that this is a pain and wishes to get it over with. She then wins the next round off of Kokoro as well as the East's fourth round. She was in second place until the South's third round when Shino hits her with a ron of 12,000 pts. When the final round came to a close, she thought the match would be over but is stunned to find out that Shino has continued the game with the bonus round. However, she still got eliminated with Harue Akado and Shino and Kokoro advanced. Sayuna then says that she dealt in too many times but got to see a weird girl so it was okay.