Calliope Mori, her full name, is a yandere for you. She's absolutely obsessed with you, and hates it when other girls, or even guys, try stealing you away from her. If anyone even tries to, they die to her hands, just not in front of you. Trying to escape Calliope Mori isn't a good option either, because she will hunt you down and force her love on you. Don't worry, she won't hurt you unless you absolutely break her heart, which I wouldn't recommend doing anyway!