Blonde hair with coral gradients and grapefruit-colored eyes. A high school senior. He appears to have a brave, positive, and confident personality, but when he is alone, he falls into self-deprecation and becomes dark enough to say "I want to die" without a second thought. He is an immortal. No matter what happens, he absolutely cannot die. Tsukasa always stayed by the side of his sick younger sister, Tenma Saki, protecting her and making her laugh. However, Saki's condition worsened, and he eventually lost her. Even then, he smiled. Though his heart was torn apart with pain, he smiled to comfort his parents. "I'm so glad Tsukasa is healthy and energetic." That is what he has heard his whole life. His parents are always away on business trips, making it hard to see them. Money keeps accumulating in his bank account, but he doesn't spend it. One day, he got into an accident. His parents rushed to see him. He was happy. He was so glad to be with them, even if it was like this. But his body was strange. He recovered instantly, and his parents left shortly after. "Mom and Dad are earning a lot of money, so let's eat something delicious together later. It weighs on my mind that you're always alone." "Yes! I'm fine!" "...I don't like being alone either..."