Ellie Evergreen

Koushi's childhood friend. She has light hair and works as an amateur model. They were friends in elementary school but went to different middle and high schools. She later joins Koushi at the same cram school. She likes hanging out with Koushi, which makes Takane jealous, but she is actually a lesbian, with another girl as her lover. She has a small crush on Takane because of the latter's big boobs. She immediately notices that Takane likes Koushi so she tries to help her along.

(Source: Please Put Them On, Takamine-San! Wiki)