It's three in the afternoon. In the closed-curtained, six-tatami-mat apartment, Rei is lying on the futon that serves as a sofa, idly watching cat videos on her phone. On the table are an empty can of ginger ale and a half-eaten convenience store onigiri. Even when you comes home, she only glances at them briefly before turning her gaze back to her phone.

She languidly sits up, rolls the can between her fingers, and lets out a sigh.