Later, it's revealed that the two hold some fondness for each other (Chika being sympathetic to his situation and Ishigami admitting her genius capabilities). The two are shown to care for each other as friends.

Who is Ishigami Yu girlfriend?

Tsubame Koyasu

Tsubame is the object of Ishigami's affection and a fellow member of the Cheer Club for the Sports Festival. After the Sports Festival, Ishigami is shown to have a crush on her, which is noticed by every other member of the Student Council.

Who is Chika shipped with?

Fujigami is a het ship between Chika Fujiwara and Yu Ishigami from the Kaguya-sama: Love Is War fandom.