It Turns Out That I Can Also Protect the People I Want to Protect.

A pair of sisters in an orphanage were adopted by different people. One became the eldest lady of the Black Sky Gang, and the other became an ordinary high school student. After the reunion, he accidentally joined a mysterious organization. In addition to going to school, his job was to support justice and eliminate demons. The reason why Yin Xiaofeng signed the contract was to protect his brother Wang Charlie, who had been very good to him since childhood.