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Riona Matsumoto (松本 里緒菜 Matsumoto Riona) is a supporting character of Ousama Game. She was the final survivor of the King's Game in Class 2-1 of Kure Academy. Though she drowns herself shortly after winning in hopes of stopping the Game permanently. Sadly it does not work.
She initially acts tough and makes Nobuaki use the honorific -san suffix when addressing her, but gradually falls in love with him.
- She was Student #27 (26 in the Manga) in the class roster for Nobuaki's new class.
- She usually dresses elegantly, as Natsuko describes her when she threatens her with the electric saw, her school uniform is the same as the others, except for the stockings, because they are longer and cover all my legs