Koi to Fukujuu no Et Cetera

On the commute to the prestigious institute, St. Gloria, Morisaki Hinatsu confronts a demon. He fights and struggles despite having a cursed bloodline. At St. Gloria, every student must participate in the school’s custom where one must use any tactics to obtain ID tags from one another. While struggling for ID tags, Hinatsu notice a demon watching him… What could this person want?