The girl with the pigtails was clearly the protagonist.I got hooked up on this manga because I liked the relationship Kusano had with the two girls surrounding him, but I feel like they haven't showed up for at least half of the manga!
Weren't those three supposed to be the protagonists? What happened to the story? I kept reading it waiting for their relationship to be explored, and now it's ending at chapter 90 and I can't even remember when was the last time they interacted!
This is just frustrating, I'll give it a 5/10.