If anyone wants to know what happen to Aria's relationship with MC
I'm super weak with unrequited love or romance so it feels so heavy reading this, I'm already having heart break just by reading this.
Hiiro actually has origin magic that he restores sliced rock back in one piece. Why he didn't use it and instead snapped after the books are burned, I have no idea.
Yeap something is wrong with the title (sounds like innuendo (●ˇ∀ˇ●)), Perfect Adaptation or Perfect Fit would be a better title imo, translation wise.
I am in awe how much her mom increased in weight after just a few chapters that I had to double take who is she. Not saying that in bad way, it just caught me off guard.
It's interesting that the author went with this route, which is plausible as it can affect Ryouma is his new body and new environment. I personally don't think it is a form a regression but an adaptation to the new variables. Neurologically, if the brain structure stays the same after migration...
This story also can be related to real life, that the oppressed and the ones being oppressed can switch places anytime. Although not as aggressively compared to the story, your own actions can also oppress others in real life and in internet if you are not careful, so exercise caution.