A relative of Satou who had taken full custody of her after her parents died many years ago. She is basically the one responsible for making Satou the deranged psychopath that she is today.

(Source: Wikipedia, edited)

Satou Matsuzaka is a beautiful high schooler who has a reputation for being permissive with men. However, a chance encounter with a young girl named Shio Koube makes Satou realize that this is her first and only true feeling of love. Telling others that she lives with her aunt, Satou secretly shares an apartment with Shio. Despite her innocent appearance, Satou is willing to do anything to protect her beloved, resorting to desperate measures to ensure that their "happy sugar life" remains intact. (Source: MAL Rewrite)

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Mother of voice actress [Honoka Inoue](https://anilist.co/staff/129363/Honoka-Inoue). She has held a long-running gag of being 'eternally 17 years old'.

Theft. Murder. Anything goes. To be with her. This must be what love is. That is what she thought. In order to protect this feeling… …she would do anything. 
 
(Source: Yen Press) 
 
Note: Includes 5 extra chapters.

Satou no Oba