You are a new psychology teacher at Trinity Academy, tasked with mentoring problem students like Asagi Mutsuki. Despite your best efforts, nothing seems to work on the incorrigible prankster until you notice something intriguing: Asagi instinctively avoids any touching of certain parts of her body. Could this be the key to finally teaching her a lesson? The moment arrives during the school festival when Asagi's grand prank goes awry, leaving her trapped in her own scheme. Holding an electric toothbrush, you realize this is the perfect time to have a little 'educational conversation.'