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Thanks for the question. Just to clarify, there are not "many love interest", therefore there will be no harem. If this is contradicted somewhere can you please let me know so I can correct it?
Thanks. 

Short answer: No. 

Longer answer: I've been slowly working on it since the first release whilst encountering lots of delays. My other game, Isolation Project, came about after the PC with Return Project save data was being repaired for extended periods of time. It became a real hassle for me to transfer large amounts of data between machines each time I sent it back, especially when repair ETA's were originally promised in days, rather than the weeks and months it became. 

tl;dr: Return Project will *ahem* return when Isolation Project nears its end.

No harem, no sharing etc. 

Potential Harem ending via choices. No NTR. As the story is (very loosely) historically accurate, there will be some "housemate" scenes but does not include any character related to MC.