The show starts out in a somewhat interesting way. Yes, the mysterys themselves are pretty boring, but that's not the issue, because obviously this is about the characters, right? I mean, they tell you in the first episode that both of them want to become normal people, so you are wondering: What is it that makes them "not normal"? Well, here is the first reveal for you, the one thing you immediately think of is true for both of them. I won't spoil the exact "solution", but the problem is that the characters want to appear deep, but they are really shallow, beacause they both have exactly two quirks that define them. And once you understood these two quirks, nothing can surprise you anymore.
And here is the thing, if the show didn't think of itself as some deep masterpiece, this wouldn't be an issue. It would just be two somewhat weird people that try to appear normal who are thrown into different scenarios. That could be an okay show. But for both characters, the anime takes its time to "reveal" their secrets and both times, I was just like: "Wait, that was not supposed to be obvious?"
This ultimately lead to the final arc of the show where suddenly things turn serious, but again, it's immediately clear what is going on here. However, we spend 3 episodes trying to build up suspense just to have one of the characters tell us all this obvious stuff in the final episode in an exposition scene that makes Sword Art Online exposition scenes look fancy. No seriously, the finale of the show is a boring exposition scene about things that you probably already realized and didn't even think they were supposed to be a mystery.
So in summary: This show is one that wants to appear deep, but once you look behind the curtain, you realize it has nothing really to offer. In terms of mystery, it is just weak as the mysterys revolve around the characters and they are just not thought out enough to surprise you. But it seemingly thinks that it has such deep characters that it can feel pretentious.
