Agasa-kun wa Yandeiru.

Ichigotani Nanako is a naturally scatterbrained girl whose ordinary school life takes an unexpected turn when she receives a sudden confession of love. The admirer in question is none other than Agasa Yuki, a brilliant and highly popular underclassman who shares her club activities and is widely regarded as the genius prince of their school. Completely caught off guard by his bold declaration, the airheaded Nanako blurts out a panicked response, telling him that she would be in serious trouble if he were to die. Through this bizarre exchange, she inadvertently agrees to become his girlfriend, setting the stage for a deeply unconventional romance. However, dating the school’s most celebrated student quickly reveals a hidden side to his charming facade. Beneath his polished exterior, Agasa harbors an extraordinary level of obsession and possessiveness toward his new girlfriend. His devotion goes far beyond normal affection, manifesting as an intense fixation that dictates every aspect of their relationship. Most alarming of all is his ruthless attitude toward anyone else who dares to approach her. Agasa shows absolutely no mercy to any unwanted pests or rivals who attempt to get close to Nanako, ensuring that his overwhelming love remains the only force in her life.