Age 26 Birthday July 3rd Height 173cm Weight 58kg Affiliation Planning & Development Department, Product Development Division Favorite Foods Fried shrimp, hamburgers, omurice, junk food Favorite Person Akinashi Haru He is a smoker. When Akinashi mentions disliking smokers during a conversation, he gets quite flustered and claims he dislikes them too. He has absolutely no idea how to cook. He doesn't even understand the concept of preheating an oven and is incompetent at all household chores, including cooking. It's to the point where Akinashi says he'll have to teach him how to cook once they return. He likes spring. Although he doesn't exercise, he is a fast runner and has great stamina. He has his own methods of training—such as standing in the same spot for long periods, passing through narrow paths, or constantly walking behind someone. An office worker at the same company and department as Akinashi. He respects Akinashi, calling him "Senpai," and always speaks to him in polite formal speech despite being the same age. He appears to be a bright, kind, and cheerful person who excels at his job, but in reality... he is a yandere. He wakes up after falling asleep on a subway seat when Akinashi wakes him, only to realize they are trapped at Saihate Station. He maintains a cheerful attitude, suggesting what to do next as they move forward to escape the station together. He is extremely devoted to and fond of Akinashi, often cheering him up. A significant yandere with a hidden side. He is the type who would kill Shion and then follow him in death. His self-esteem rose by looking at the reclusive Haru, who seemed inferior and clumsy compared to himself, and eventually, other emotions filled that space.

Shion's twin sister. Their parents divorced in the past, and each child followed a different parent, resulting in different surnames. She is Haru's ex-girlfriend. She was murdered by Shion. A kind, bright, cheerful, and warm, beautiful girl.