So the idea was becoming ordinary, but did they even try? :D
Osanai and Kobato are two highschool students that want to become ordinary due to an event that happened in their past. These two really like to solve mysteries, especially together. But this aspect of them actually made harm for theirselves or others many times in their past so they want to get rid of it. Mysteries they solve are pretty hard to accomplish to be honest. I've seen some other people that really want them to be couple (including myself), but I think, mysteries were more interesting than that. There's always events happening and they pretty much everytime try to solve it so there's no time to be thinking that...
Next, drawings and colouring. I found the drawing style pretty unique especially the eyes. The drawings were desprate and the colouring was really relaxing, this contrast is pretty hard to accomplish..
I want to add a paragraph to explain something different because it really caught my attention. When these to start to thinking, like weighing their opinions, getting the pieces together, we see a separate universe at the background. These backgrounds had no people in it, filled with silence or natural sounds so there was nothing to distract from thinking them. I suppose, this might be a symbolism. Because these two had a habit of solving mysteries since they were at middle school so they're used to thinking. These backgrounds may symbolise their minds. They think together and they don't get distracted from anything which means emptiness and silence no matter where they are.
Lastly, the characters. I wasn't expecting depth in characters but last episode did include some of their pasts which gave Osanai and Kobato a meaning, they were not shallow.
Overall is 8.4/10. I would really like to give a score higher than 9 but the idea is not that peculiar, just solving mysteries so this is what i gave instead. I think some people might think the anime is monotone, but I enjoyed it.