I'm Not a Bat Cub

When he fell from a height, Ciel closed his eyes and calmly decided to end everything. When he opened his eyes, he found that there were more memories in his mind - he came to a new time and became an experimental subject. The experimental subject was in this research institute as soon as he opened his eyes, but he had the same appearance as Ciel. But the good news is that the devil's contract is bound to the soul, and the devil who becomes his butler will still obey his orders. ———— But—— Although I also have black hair and blue eyes! But I don't want to be a bat cub! ! ! Purpose: Fight against darkness