Shiromi Kosegawa is a third-year student at Miyamori Girls' High School in Iwate Prefecture and a supporting character in the manga "Saki". She has a stoic personality and is somewhat apathetic, disliking situations she considers troublesome. Shiromi is a tactical mahjong player and can accurately observe her opponents' plays.

Spoiler

According to her teammates Shiromi has a unique style. When she worries about her hand, it usually means that its high scoring and normally scores her points this way.She is tactful when it comes to her opponents hands and has solid defense. She often discards what others call risky tiles but it hasn't been shown to backfire on her.