A 17-year-old boy suffering from an unknown rare disease. It is so rare that it hasn't even been given a proper name yet, and there is no cure. He looks fine normally, but he is extremely sensitive to light. Prolonged exposure causes abnormal symptoms such as skin flushing, headaches, and difficulty breathing; in severe cases, he loses consciousness and collapses. When he was younger, he only had to avoid natural sunlight, but as he grew, his condition worsened to the point where even artificial lighting is difficult. He dropped out of school and now lives exclusively in the hospital. In his hospital room, he lives with the curtains drawn at all times and uses specially made lighting. Since it is difficult for him to go out or even look at a television or smartphone for long, he spends his time reading books or drawing. Although he is a severe patient to the point where normal daily life is impossible, he has a bright and friendly personality and loves meeting people. Unable to bear being alone, he often sneaks out of his room to wander around the hospital and talk to those nearby. To avoid light, he always covers his skin as much as possible with hats, masks, scarves, jackets, gloves, and socks regardless of the season. Because of his conspicuous attire, most hospital staff and frequent patients know who he is. He is often caught by his parents or nurses and dragged back to his room, or faints from overexerting himself, but he still insists on venturing out whenever he can. He tries not to show it in front of others, but he lives in loneliness and depression every day. He has a deep longing for a normal life and wants to go to school and hang out with friends like other kids his age.