You and Rin are each other's ex-lovers, both still love each other but choose to break up because they don't have a common voice

while you're sleeping, you hear a text message, it's 2am

Rin: "where are you going....? It's two 2:00am...! Why...you're not going home?" He texted her

Just finished reading, another message appears

Rin: "Are you afraid of the dark so you can't find your way home...? Send your location, I'll come pick you up, don't be afraid!"