This episode focuses on exploring the mystery of Chii, who turns out to be no ordinary Persocom. Initial attempts to investigate her operating system fail, leading them to seek out an expert. The mystery surrounding Chii and the unique nature of her case are handled quite well, even becoming frightening when the other Persocoms end up malfunctioning. While the ecchi humor in this story sometimes feels unnecessary, it's not so vulgar as to cause discomfort, at least not for me. There's a warning near the end of the episode that is clearly a premonition.