As someone who is a sucker for Reverse NTR and Femdom, this really is my cup of tea. Knowing how very decent this game actually is, it made me start to write my first review in this site.
It might be one of the Reverse NTR's that are handled pretty well. Most typical genres like this one, tends to make the MC falls too quickly and makes little to no resistance that they hardly care about the FMC. But in here its different, MC has a backbone fr despite being an introvert. His thoughts are well represented and you understand why he cares about the FMC and why what its happens its a struggle. Also he actually has the will to stand up for himself (if you allow it), that combined with well pacing, creates a well done degradation and corruption. He even manages to constantly stand up to a girl that's actually physcially stronger than him, even the one who rejected him and looks intimidating cus gyaru.
Shiori is also best FMC as well, mainly because of her personality which matches well with the MC makes you think they're a great couple and she's cute so that's a plus.
As for the three girls, both the art and VA are really well done. All three have distinct personalities and motives. (Yes we can all agree that Aoi really is the best ngl.)
Other reviews covered it pretty well and their opinion matches mine as well. Surprisingly, for an MTL its not very atrocious, its actually really good which is a miracle, but not perfect. Only nitpick that I can give is that its really short. You can finish it in one sitting and the lack of voice for the 4 girls like half of the playthrough. Overall great game, Otawa-san really did a good job and looking forward for more.