Keiko Yukimura

Keiko is Yusuke's childhood friend. They grew up together in the same school since they were kids. In many ways, Keiko is the opposite of Yusuke. She is sweet, calm, and does not use foul language. She is also equally known for her intelligence (she is the class representative of their section) and dependability. As a class representative, she often scolds Yusuke because of his bad student habits like skipping classes and being absent for many times but inside, she really wants to protect him.