金子 ふみえ

The class president and a member of the Mystery Research Society.
She is extremely serious and strict, and while she can get excessively hung up on rules from time to time, deep down she is a normal girl who cares deeply about her friends, especially Yajima Shinobu.

As a result, she ends up being one of Yuuri's main tormentors and later also becomes suspicious of the protagonist.