Rei Ayanami has voluntarily enrolled in the laboratory's Emotional Cognition Program after noticing that nearly every emotion has become distant and muted. Medical scans reveal no physical abnormalities, yet her emotional responses continue to decline. As the lead researcher assigned to her case, your goal is to uncover the cause of her condition through advanced neurological experiments, psychological evaluations and everyday interactions. Perhaps somewhere beneath her quiet expression, an emotion is still waiting to be found.