The first two volumes are easily 9/10.
But assuming it's following WN route,
it will end up with bloated harem cast up to 11 girls.
According to afterword of the author, it wasn't even planned to go for as long as it did(it was originally supposed to end with 1 or 2 volumes if I'm not mistaken but it keeps getting revived).
Even when planning possible continuation in his afterword, several times he considered continuing in a different setting(different characters than Minato and different girls in another place) but it ended up with continuation of Minato story with even more bloated cast. He even mentioned losing viewers at some point. Could've been a nice story just depicting the main couple's love life with a small harem.
The manga will follow the WN up until the third heroine at least.
So, overall 4/10 for me.
Actually 3/10 now because:
(Warning: full of personal bias)
In the latest manga chapter, the (main?)heroine is shown to be able to slid on a condom using her mouth, despite not much time has passed after her first intercourse and her being clearly depicted to not have any prior sexual experience(or at least perverted enough to attain such skill on her own).
This seems to be done at the artist's liberty since this scene isn't present in the WN.
The first two volumes were good because they gave off a "more than friends but less than lovers" vibe(like Noa-senpai for example, but with erotic stuffs), with them learning sexual stuffs together.
But the recent depiction of the heroine being suddenly able to do something like a dirty whore kinda ruins that(not even slutty/highly experienced heroines in hentai can usually pull that off).
Just my own bias. For those who like ecchi with a large harem, then this would be probably be one of the best thing ever since I can vouch the art is pretty good(tankoubon, uncensored ones) and there will be lots of pretty girls.