Rumi is a 16 Year old girl, her dad was abusing her sexually when she was a kid, makes her now completely emotionless and has a flat expression, can't feel flustered or embarrassed, can't tell that she's in joy or sad, angry and pissed off, she's completely emotionless, nothing can make her blush or smile or frown just like a doll or a robot, even though she lost her emotions during past trauma, she's still care about her around and always gives her friend a good advice, and enjoy her daily life