Review of Sing "Yesterday" for Me

I had so many conflicting emotions while watching this anime. I started off loving it because they featured a lot of my favorite seiyuu, and the animation was great, as well as the music. I love a slice of life that features adults! (Spoilers ahead). However, once I hit episode 7, my feelings toward the show changed. Funnily enough, it felt like I was being played. Why would they present Haru as the main love interest, if they were going to treat her that way? I kept asking myself, "Am I being led on too?" I think they spent too much time on the "relationship" betweenRikuo and Shinako. At one point I hated the couple for how they were treating their admirers, especially Haru.
Also, I don't think the show did a good job of /showing/ their developing feelings toward their admirers. So when the ending came about, it was underdeveloped. It felt like they quickly wrapped everything up, and the viewer was supposed to accept it.
It's wild how I went from loving the show, to absolutely hating the storyline, to feeling something akin to "Well.. okay". Regardless of that, I think the show was alright and I don't know, since I had such a strong reaction, perhaps that's good sign? Perhaps not.