I thought it would be about a girl being infatuated with her teacher and her trying to get him to like her back despite the age gap and school rules, but even from the first chapter you can see that they both are in love with each other, so no spoilers there. In fact, because of that, the first approximate fifteen chapters don't follow a clear plotline. Kaji and her younger brother live with her teacher because she has nowhere else to go, and they don't want their relationship to be exposed. There are a bunch of small adventures to fill up the beginning where they get into situations where the two are close and others where they could possibly be caught. They always manage to make up some story about why they're always together, though, to make sure sensei's superiors don't think it's inappropriate. I thought I might drop it after a while. However, once a few new characters were introduced, the drama increased and I found myself reading a very quick pace--try 25 chapters in one day. Then I thought it was very good and some moments were extremely cute and others painfully sad. It was a good read for me.