If you haven’t seen the first season of Gin No Saji, you should watch that first.
If you’ve already seen the first season, you shouldn’t need me to tell you that you should be watching the second season.
I don’t think the plot is going to engage in any kind of literary fireworks. I just think the writer had already delivered some good writing, and will continue to do so. This story has many little pieces, like the little wheels in a clock, and I think they’re all going to fit together very nicely.