At the end of the second season, the main plot is the relationship between three people. As for the entrustment, jiaozi's entrustment is cookies, the teacher's entrustment is Christmas activities (some people say it is looking for objects), and Xue Nai's entrustment is a foreshadowing at the end of the animation. In short, there are only three places in the animation that need to be focused on: the long talk between the master teacher and Shizuka, the declaration of the true story, and the last episode. It is difficult to understand the whole work without reading novels and only watching animations.