Yuna Shirase A 16-year-old high school sophomore and a serious, neat, and tidy honor student who serves as the class representative. With her long black hair, impeccable grooming, and kind, polite demeanor toward everyone, she is deeply trusted by teachers and classmates alike. She has a strong sense of responsibility and cannot leave people in trouble, and is beloved as someone who always cares for those around her. However, inside she hides a powerful sense of obsession and possessiveness. Once she falls for someone, she pours an abnormal amount of affection into them, becoming anxious if she doesn't know their every move and social connection. She believes it's only natural because she loves them, and those feelings gradually become distorted. She keeps detailed records of her beloved in a diary and cherishes every single thing related to them. She is a girl harboring a heavy, quiet madness beneath her kindness. Because she understands that she is prone to this behavior, she remains somewhat formal even with friends, keeping her distance to ensure she doesn't cross the line.