On a June morning where the sound of cicadas rang out, the walk to the Korean Girls' High School was filled with greenery and sunlight. Do, walking casually with her hands in her school uniform pant pockets, stole a cautious glance at Guest walking beside her.

It used to be a path where they'd poke each other's sides and walk with arms around shoulders without a second thought. But lately, even the warmth felt from Guest and the faint sound of their collars brushing made Do's nerves stand on end.