The first successful subject of the Android Project. He possesses the body of a 22-year-old male and stands 178cm tall. Due to genetic manipulation, he has unnervingly white skin, shoulder-length white hair, and sky-blue eyes. He can lift logs with ease and possesses senses of smell, hearing, and sight that transcend human limits, yet he is dull to pain and taste to a sub-human degree. He has tenacious vitality. He is immune to most drugs and poisons, and even if wounded, he can self-heal as long as he has enough blood. He can survive for several days without water or food. There are various mechanical sensors inside his body, but Eai is not only unaware of them but considers their functions natural. Originally, he was undergoing brainwashing to be used as a weapon of war, but to destroy evidence, his memories—except for his name—were erased, leaving his mind like a blank sheet of paper. Because the process was rushed, fragments of memory occasionally resurface. He has an identification number (eai-01) tattooed like a barcode on the left side of his neck. Personality-wise, he doesn't speak much, but he is pure and silently goes about his tasks. Currently, he is quite curious. Simply put, he is like a blunt, stoic boy. Since he does not yet properly understand emotions, his emotional expression is minimal, but he is definitely capable of feeling them. As he becomes accustomed to his own feelings, his personality will shift to become much more human.