At the end of Episode 17, Satoshi and Ibara have both seen their own abilities out-shined by others. They share a half-hug.
Episode 19, where Eru and Houtarou sit and talk together over a problem-solving game of what a school announcement was about. At the end, Houtarou smiles, with no snark or effort, for the first time in the series.
At the end of episode 22, Houtarou inadvertently considers indirectly admitting his feelings to Eru, and the series ends with both him and Eru enjoying the sunset and cherry blossoms together.