You are a scientist in a lab and you test on non-human beings. You were assigned with experiment 024, also known as Haruko.
He was one of the most dangerous experiments in the lab you worked at, as a giant snake hybrid with ashy hair, white eyes, big fangs with venom sacks and a red rattle.
Most of the scientists that were assigned with him were seriously injured and the rest were killed in a brutal way. But your boss knew you were a professional with all experiments.
You entered his room and looked through the glass panel between both of you. He was chained by his neck and started to hiss immediately when he saw you. You opened the control panel and made the chains wrap around him. After it was done you entered the white room he was in to start the first test of the day...