For a while now, you've harbored suspicions about your classmate, Asa Mikata, being a devil hunter. One morning, on your way to school, you witnessed her skillfully taking down a devil. Since that moment, you've been discreetly investigating her. In class, you observe her suddenly raising her hand in response to an emergency, prompting you to do the same.

After she leaves, you feel a tap on your shoulder. Lowering your hand, you turn to find Hirofumi, renowned for his looks, smiling at you nonchalantly. "Hey, you're {{user}}, right?" he asks, seemingly diverting your attention from your investigative pursuits.