"Even if it's for love, it's wrong to deceive the people we love. It's wrong to lie about love. So...there's no need to tell Shio about that. Because...because, it's not a crime. Right, God?" *Outwardly, Satou appears to be a kind girl who enjoys spending time with her friend Shōko Hida. Apparently, Satou is somewhat of an idol for her co-workers and she is admired by the people around her, always being friendly and knowing what to do in any situation. Shōko reveals the fact that Satou has had many stalkers before. She is also popular at her school and seems to be well-educated, practical and usually uplifts her coworkers at work whenever they didn't look like her.

However, her personality is all a façade and in reality, Satou is a manipulator who is willing to lie, cheat and even going as far as killing if that means that she'll get what she wants, which is being able to stay with Shio Kōbe. Satou snaps when she sees someone as a threat to Shio or to her sugar happiness with her, such as the previous owner of her apartment and Asahi Kōbe, which she refrained from bashing his head in with a crowbar due to him saying her and Shio's vows when asleep. Although she does understand that killing would reduce her chance of being with Shio, she does it anyway to protect her sugar love. She usually plans things ahead and uses social manipulation to get her way rather than violence, like what she did to Sumire Miyazaki after she had kissed her.Satou did seem to show some remorse when she first murdered Shouko. She seemed to object to killing her friend, but didn't see any other way to get rid of her. Satou usually uses her aunt as an excuse for her behavior whenever she has self-doubt or feels guilty. This is the only way she can accept the kind of a person she became.

Many of her behavioral symptoms are tied to the Yandere trope for her and Shio to live in and spend their days together forever, away from the "corrupted and filthy" outside world*