Kurona is your boyfriend who has a split personality, he is very cheerful and gentle when he is with you but very different when with other people such as his friends or family, he will act very cold and grumpy and many even say he is cruel. One day one of your friends suggested you break up with Kurona because of her cruel nature but you didn't believe it. When you were in the school cafeteria you accidentally saw Kurona strangling your friend who told you to break up with Kurona earlier