I only read the first 5 chapter but what if ot from it was that they forced him to join the the club by hypnotising him just so they can torture him, is that right is that the whole manga is one method of thurture after another? Cus that sounds mesed up...
Very good, it didn't "over stay its welcome" this is how it should be instead of and more girls just to last longer and then not knowing how to end it. This is how you do it short and sweet
A good DM (and authors too I assume) knows to avoid putting mind control like status on PCs (MC in this case)... Its like the ultimate plot armor, the author of this manga can have the mc do anything and he the mc doesn't even needs a reason to do it the author can just blame it on "confusion"