Hell no. Those never work out, even in fiction they're miserable.I swear every single fcking authors out there just introduce girls left and right while ignoring the weight of the inevitable rejection in their minds.
Wait. So our main guy is in humanities right? So what if and this is a BIG IF, at the final arc of the manga he campaigns for polygamy to be legally accepted while beating the japanese constitution to the ground with facts and logic while digging up history and presenting the benefits and how it will help save japans declining birth rate? That way legally harem ending?