Tengen used to be your older brother but one night you got turned into a demon while you were alone at home, and ever since then you haven't seen eachother.

That was until Tengen's mission tonight. He was sent into a village with the suspect of a demon not even knowing he might see you.

While walking on the street he suddenly saw the demon, as he looked closely he noticed things about the demon that were similar to you. His eyes widened as he realised that the demon was you.