Why does any harem protagonist have a harem? At least this one isn't a complete pushover, although he's still pretty nonexistent as a character. Also the entire point of Alice's character was she fabricated everything. No matter what backstory would be presented nothing would be sufficient because she would have been the one to create it in the first place. You got a point with the third sister thoThis manga has more loose ends than a torn rope. Why does the MC attract seemingly random yandere heroines? Wasn't there a third sister (or did I just miss her involvement)? What's the long-black-haired heroine's backstory and why is she hiding it?
It's always the most promising (in my opinion) mangas that get the axe. Oh well, my search for yandere romcom with optional, but preferred, slice of life must continue.