After a History class extended by his random question, Touma finds himself without any lunch to eat with the food in the cafeteria running out before he could buy one for himself. Twenty of his classmates share his fate, but they decide to send out someone to buy convenience store lunches. Fukiyose Seiri leads Touma, Aogami Pierce and Tsuchimikado Motoharu on this mission, but only Seiri, Touma and Motoharu were able to break out of school premises, with Aogami taken in by the guidance counselor Saigo as a sacrifice.