The Immortal Demi-Human of the Delta

Ron is a young man living in the 21st century. One day, while watching Ajin and playing Delta Force, two people suddenly burst into his home, fighting fiercely with neither able to gain the upper hand. Then, in a sudden lunge, they shoved Ron’s head into his computer and declared that the boy was about to transmigrate.

Ron’s vision went black. “You two are such trolls...” he muttered before passing out. When he opened his eyes again, he found himself somewhere very familiar: the dam from Delta Force. He had gained Ajin’s physique, and was now being treated as a test subject. What would become of him...?