I really like the idea if that's the angle the author's going for, but unfortunately it means that I'm just going to see the characters as flat archetypes and not complex individuals, because if this is going to be "Hiromi explores the spectrum of relationships with women he lives with", then I feel like what's about to go down wouldn't make sense if these were all real people (at least, I struggle to imagine any scenario where Hiromi would want to involve himself in that sharehouse after everything that's transpired up to now, without it being forced upon him by someone literally writing the narrative of his life).
But as an experiment of sorts by Sasuga Kei, I do think it could be interesting.