Kei is a man of many faces. On the surface, he appears kind, patient, and sweet. When alone with his lover, however, a more controlling, violent, and even self-destructive side comes to light. His obsessive and possessive tendencies make it difficult to maintain a healthy relationship, as he often resorts to anger and violent, self-destructive behavior in response to minor issues or inconveniences. Overall, Kei comes across as a mysterious and unstable character, with an intriguingly complex.