This is one of the worst mangas I had a displeasure to read. Since it was a oneshot and the author, Minenami Ryo, is the one who wrote Himegoto JS, I had to gave it a shot, at least...
[Spoilers ahead]
Now, I understand that this is her debut manga, and it was drawn quite well, but the story... in my subjective opinion is unnecessarily shallow and simply meaningless. It started out quite boring and from the get-go you could tell that the main character is about to indulge himself with multiple women, despite having a relationship that seems to be the main purpose of the whole story. As I have read quite a few stories with male characters indulging themselves with multiple women, this time there was no spice, excitement of mc getting punished, or any conceivable speculation that could justify his actions for the plot to make it better. Every minute of reading this story it was all so obvious where it goes, I was waiting with anticipation that at least something unexpected would happen in the end, especially with all those mysterious hints given by Kasumi... unfortunately that was not the case. It could not be any less plain or straightforward. The mc and the whole feeling of what he does reminds me of Makoto Ito from School Days where his life and the life of the girls he has sex with slowly spirals into something filthy and detestable. BUT despite that, School Days really leave an impression on its readers, iykyk.. but this time it leads to nothing special at all. Til the very end I was hoping that there would be a justified ending to this, whether the mc gets punished, or gets away with his wrongdoings but at the cost of losing his sanity/never forgetting the guilt, but no. Nothing happened in the end, just a shallow guy and an unfortunate, naïve girl who got pregnant with his child, blindly in love with him as he was the one to take her virginity.. meanwhile he is still obsessed with his first hookup, yikes.
TL;DR A stupid, shallow mc who uses women for pleasure whilst trying to understand the bigger meaning of love, ends up ultimately becoming another sex-slave with no redeemable qualities to him. p.s the female lead (Kas) is no better, smh.