I can't be the only one who can't remember who these characters are. They all look identical and the art is so busy it's hard to even follow along. Also, since it's monthly I barely even remember the plot. I think it's time to drop this one, unfortunately.
I'm not going to go after you for getting mixed up on the characters. A similar thing happened to me with
The Moon on a Rainy Night a while back where I just had no idea what was going on as I had completely forgotten the ongoing plot threads. In that situation, though, it was because I had gone on a huge binge of yuri manga and
The Moon on a Rainy Night was near the start, so it got muddled with a bunch of other stories. If that's what is happening to you, it'll get easier when you aren't reading as much.
All-in-all, though, I can't really criticize you for not remembering the characters or plot details. However, I will say that I don't think you should be faulting the story or art for this. Not remembering what is going on or who is who is strictly your fault in this case. It's not a bad thing that you're forgetting, of course, I just think it's unfair to be blaming the manga for that.
Really, it just sounds like you shouldn't be reading this one monthly. Maybe put it on hold and pop back in after each story arc? Because it doesn't sound like you think the manga is bad or you're not enjoying it (hell, you say "unfortunately", so I assume you enjoy the manga), it is just that you're really confused and have no idea what's going on.