I'll update this review as the story progresses and I'll refrain from rating it for now. As of now there is a good amount of content to review.

Lets start with the elephant in the room: the writing. It is pretty bad, even after editing. Sometimes you can't even understand what is happening or you have to decipher what a character is saying. English is probably not the authors main language.

Despite the tags such as yandere and BDSM, not much has happened in that department. Romance and love interests haven't been the main focus of the story. Personally, I hope that changes since there is only so much action you can read before it gets dull.

Speaking of action, the whole demon slaying thing going on with the system is interesting. I like how the author is using low levels instead of lvl 300 or 500 and such. 

I think that there are only 2 plot holes or flaws I've identified so far. Number 1: sister is stated repeatedly to be stronger than MC but MC in rage mode was able to pull her hand away from her grip. This should be addressed. I am aware that maybe the sisters stat distribution is not primarily strength focused but everyone fears the sister so she probably has very high strength since that seems like an important stat. Number 2: the clothes of the demons on the ground should still arouse some suspicion it would be like leaving a dead body

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