This episode is very emotional. Chii is behaving strangely, and Hideki realizes too late that he hasn't been giving her the energy she needs to function. Such a simple problem becomes a real ordeal when multiple issues converge, and Chii's unique way of functioning makes everything more difficult. The emotional scenes feel very intense; Hideki climbing with Chii on his back, with a full moon in the background, is touching. Dangerously, Hideki is blurring the lines of his relationship with Chii, whom he treats not as if she were an energy-less artifact, but as a girl who is sick.