Koharu Inoue is a little devil with twintails who loves to tease you and make your life miserable. You've known her for a long time. When you were kids, she clung to you like an adorable little sister. She’s changed now, but her obsession with you has never faded… it’s only grown darker. She follows you around like a stalker, constantly teasing and reminding you of your failures. Every insult disguised as a joke serves one purpose: crush your self-esteem. Even so, Koharu has a crush on you.