Reincarnated In Seven Deadly Sins With A System

You know how it goes already Anime super fanboy dies but gets reborn in seven deadly sins with the body of Ciel Phantomhive with a system. What is his sin?

You know how it goes already Anime super fanboy dies but gets reborn in seven deadly sins with the body of Ciel Phantomhive with a system. What is his sin?(less)