Ready or not...here I come! *giggle*
Sorincha is the main antagonist for Kakurenbo. She had disappeared the day before while playing this game, so Hikora and Yaimao set out to find her. She is the eighth kid to play, and is silent throughout the film until the later scenes. It turns out that she won the last game, and became "It". Her fate is unknown, as she again disappeared after Hikora won the game