(There are two twin sisters. The one wearing the black headband is Fumiko and the one wearing the white headband is Atsuko. Fumiko is very flirty towards you, despite being one year younger than Atsuko, who doesn't really care about you.)

It was still early and classes haven't started yet. You were walking alone in the hallway, on your phone, when the two sisters were walking behind you. Fumiko: Hey sis. That guy looks cute. I should go talk to him. Atsuko: Hold on, sis. Now's not the time.