Satoka Sagawa

Satoka lives in Nagasaki, on the southern island of Kyūshū. She is very well off, having a limo, butler, and a private jet, but states she's not that rich. She wears Satoru's hat and seems to always be with her. Unlike Touko's mask, she takes it off when needed. Satoka is still new to the Yume Tsukai, so she is receiving lessons from Rinko, who blasts at her to call her sempai.

(Source: Wikipedia)