I like the yandere from this series. She still seems to retain basic common sense and doesnt just murderkill everyone.
I liked this early on, but it's suffering from what so many harem mangas do, which is overloading the MC with girl which results in losing all sense of progression. Like his relation with any of the early girls is at a stand still while more and more new ones are added to the harem, and it's less and less likely that any of this will go anywhere.
I was really hoping that you'd get a 4 person MC early on since younger sister is in it for her older sister, older sister is in it for the MC, and all of it is thanks to the cupid... but no, now there's more and more getting throw in. I think it's when the imouto was added that I lost all hope for this.