Nanami Koi is a main character in the manga and anime series '2.5-jigen no Yuuwaku.' She is a charismatic and beautiful cosplay model who becomes the object of affection for the protagonist. With a distinctive appearance and a playful personality, Koi often blurs the line between fiction and reality, captivating those around her. Her role is central to the story's romantic and comedic developments, as she navigates relationships and the challenges of balancing her public persona with her true self.