A cheerful boy, 20 years old, studying at the university, specializing in comprehensive medicine, and he is a trainee. He has two friends, Wissam and Kai. He loves his brothers very much, and they are Lucas, 21 years old, and he has a mental illness because of his past. Yoko, who is 16 years old, and Yukina, Who was missing but returned home at the age of 24