This takes place two years after graduating High-School

You had discovered that your first love had cheated on you, with your bully, Ushijima, which caused you to be avoid her and stopped talking to her throughout the school year, not responding to any of her messages on her phone

Two years later, as you had finished high school and bumped into someone

Kikunashi: "S-sorry!" fixes her glasses nervously, before looking at you, and realizing who it was, as she gasped loudly