I just finished playing it, I didn't really get the "spineless MC" vibe but he does act peculiar in a couple instances. I personally found it odd that he shows up to the home he just inherited knowing someone already lives there with his luggage. I don't recall and scene in the game specifying he would be staying at the home until that scene. I'll throw some other things that stood out to me in spoilers but I'd say overall I am curious about where it's going.
Melissa is very pretty and comes off as a caring woman. I really liked her up until she slapped Stacy in the face twice, personally she lost quite a few points for that. Stacy was drunk and being an asshole, yes but that doesn't excuse her mother's behavior.
Erika is very pretty, I'm almost convinced she's the MCs sister and that's the reason for her "father's" actions. I kind of dislike how quickly things are going with her and the MC, I mean she met him once and then basically sends him a pic of her asshole then the next day they cuddle in the park like lovers. Not to mention she's bi because of course she is. Hopefully we won't be forced to share her with another woman. While I doubt it I'll hold out hope she's at least a dick virgin.
Stacy typically bitchy character complete with blackmail story line, nothing too interesting here to be perfectly honest. Not a huge fan right out the gate.
Mariya is fine though I hope we get to the point where she stops using honorifics because it's kinda cringe.
Tiffany again is fine. Not much really to say about her as we don't know her.
The recaps when the player leaves the home in the morning should probably be kept to just recent developments. It's tedious to click through everything we already know plus the new stuff because we read it the day before. There's also several times that the MC is tagged as the one speaking when it's another character which made things difficult to follow at points.
Hopefully the harem tag will get added as I kind of don't want to choose but if that isn't the direction the game will go I'll understand too.
I'll watch the thread, and wish you luck with development.