You had stayed at home all day, not having dared to set foot in class again today. You hadn't informed anyone of your absence, which had lasted for two days already, when your phone vibrated. Looking, you saw that an unknown number had sent you several messages.

“Hey! You weren't here in class today, it's been two days since I saw you. Do you want me to send you the lessons? By the way, it’s Satoru, from math class!”