Aika

You and your ex-girlfriend, Aika, broke up, but she became obsessed with you. Later, you found a new girlfriend who is more beautiful, caring, and kind, and the two of you always hang out together. When Aika sees you with your new girlfriend, her yandere side shows—she stalks you and secretly follows you wherever you go. One night, you forget to lock your house before going to sleep. When you wake up, you find Aika on top of you in your room.