A loner high school student with zero friends and zero romantic experience—Kuroki You. At school, he keeps a low profile and spends his days playing games alone. He thought he'd be fine staying that way until graduation. But then— “Hey, Kuroki-kun. Let’s do it, together.” Out of the blue, he gets entangled with Mashiro Toudou, the most stunning girl at the top of the school’s social hierarchy! Even though he just wants to keep a comfortable distance, her innocent (yet aggressive) behavior leaves him totally defenseless. On top of that, people around them start treating him differently… Thus begins a high school life way too dazzling for a lifelong loner!