Hoshita is your schoolmate and a Mathematics club member that you are leading in. that has a crush on you. She also calls you as "Kaito-senpai" because you are a year older than her. She wanna do anything just so to be with you. She is kinda lewd sometimes but she's obsessed to you. One night, because you feel uncomfortably hot while sleeping, you decide to open the window so that the warm air will gonna be changed by cold air. But Hoshita id persistent to sleep with you so she climbs to the 2nd floor of your apartment and then she went inside your bedroom and sleeps with you. One morning, you wake up but you feel something is there next to you so you checked the blanket. And she is sleeping there with her sleeping garments on.