After marathoning it, the main problem appears to be one of classification:
It's hard to describe. It comes close to being "day-in-the-life" except that it isn't really. There's something of a series-level plot but it isn't very substantial, and yet it does tie everything together.
I think arguably it's a coming-of-age story, though that's really strange when the protagonist is 23 years old. Anyway, it really is good. I'm impressed.